The White House was placed under a brief "lockdown" Sunday after "party balloons" drifted over the grounds and landed on the North Lawn, U.S. Secret Service officials said.

The agency said the White House reacted "out of an abundance of caution," after balloons landed on the North Lawn, the press office roof and the Eisenhower Executive Office Building.

The Secret Service said there was no "lockdown" per se, but press crews on the grounds reported they were temporarily restricted in their movements.

The incident comes less than two days after a Secret Service agent shot an armed man who approached a White House security checkpoint, placing the executive manion on lockdown. The man, identified as Jesse Oliveri, of Ashland, Pennsylvania, is still listed in critical condition after he would not drop his weapon and was shot by a Secret Service officer.

Dallas police confirm a 17-year-old boy stabbed a 19-year-old woman during a high school graduation on Saturday.

It happened a half hour into the graduation at Dallas Lutheran School in the 8900 block of Stults Road around 10:30 a.m. on Saturday.

Dallas police said a 17-year-old male stabbed Camille Smith of Plano with a pocket knife. Smith was not a student but a guest of a graduate. She was taken to the hospital and treated for non life-threatening injuries. 

Dave Bangert, executive director of Dallas Lutheran School, said in a release that the attacker was "quickly subdued." Police said he was charged with aggravated assault with a deadly weapon. It's not known what provoked the attack. 

"The school was immediately locked down and after an appropriate time the ceremony resumed after prayer for both the victim and the attacker," said Bangert in a statement.

The school said the rest of the ceremony went on without incident.

Plainfield police are searching for a suspect who shot a man in the head with a pellet gun.

Plainfield police say they responded to a home on South Pine Street around 10:50 a.m. Sunday. When they arrested they located the victim, a 47-year-old male, with injuries to his head and arm. The victim said that he was injured with a handgun during an altercation with a suspect who fled in a green Mercury Mountaineer.

The victim was transported to William W. Backus Hospital for treatment of non-life threatening injuries.

Police have located the suspect weapon, which was determined to be a high powered pellet handgun, and the suspect vehicle. Police say this is an isolated incident and that the victim and suspect are known to each other. The suspect has not been publically identified, but police are in the process of getting an arrest warrant.

Waterbury police are looking for the driver of vehicle who fled the scene of an accident that left two women injured.

 Police say around 6 p.m. Saturday one of the victims, identified as 45-year-old Sonia Velez, parked her Nissan Murano on the east side curb in front of 1722 East Main Street. As she got out of her vehicle and began crossing the street, an SUV traveling in the westbound lane swerved into the eastbound lane and struck Velez. At the same time, Velez’s sister, 45-year-old Elizabeth Velez, was exiting the rear of the Murano. The suspect vehicle grazed the rear door of the Murano, causing the door to slam back into Elizabeth Velez’s head.

 The SUV reportedly stopped for moment then fled traveling west on East Main Street.

 Sonia Velez sustained non-life threatening injuries to her head and face. She also suffered a broken pelvis. She was transported to St. Mary’s Hospital for treatment of her injuries. Elizabeth Velez sustained a laceration to the head.

 The suspect vehicle is described as a blue Blazer-type vehicle with a male operator.

 Anyone with information should contact Waterbury Police.

A woman was seriously injured in a motorcycle accident in Bristol Sunday, according to police.

Police say they responded around 6:22 p.m. to RedStone Hill Road Lane near the intersection of Prestige Lane for a reported crash. Upon arrival officers found a female motorcyclist suffering serious injuries to the chest. She was transported to the hospital by Bristol EMS. She has not been publicly identified at this time.

Police say the rider was traveling east on Redstone Hill Road and left the right side of the roadway, crashing into a wooded area. She was thrown from the vehicle.

Anyone with information on this crash is asked to contact the Bristol Police Traffic Division at (860) 584-3030

Two people were transported to the hospital after a head-on crash in Tolland Sunday night.

Tolland Fire officials say they responded to a two car accident on Crystal Lake Road near High Ridge Drive around 7:45 p.m. Firefighters and emergency medical personnel removed both drivers from their vehicles. Neither car had passengers. One was transported to St. Francis Hospital and the other was transported to Hartford Hospital.

Neither driver has been identified at this time.

The road was closed for just over one hour. Connecticut State Police are investigating the crash.

This story is developing. Check back for updates.

The gunman authorities say killed a police officer and injured a Massachusetts State Police trooper was fatally shot Sunday.

Just after 6 p.m., state and local police encountered Jorge Zambrano at 31 Watch Street in Oxford, according to state police.

"As [troopers] entered a bedroom, the closet door burst open," said Massachusetts State Police Col. Richard McKeon. "The suspect appeared from inside the closet and fired on the troopers, striking one of them." 

A trooper returned fire. Zambrano was shot and taken to UMass Memorial Medical Center, where he was pronounced dead.

According to state police, Zambrano shot and killed Auburn Police officer Ronald Tarentino Jr. early Sunday morning.

Police say Zambrano was known to law enforcement and has an extensive record. He was recently arrested on charges that went to Worcester Court.

Tarentino, 42, a husband and father of three, was shot around 12:30 a.m. on Rochdale Street in Auburn during a traffic stop. He was taken to UMass Medical Center in Worcester, where he was pronounced dead.

The injured trooper, who police say Zambrano shot in the left shoulder, is expected to survive. He is set to undergo surgery Sunday night at UMass.

According to Massachusetts State Police spokesperson Dave Procopio, the trooper Zambrano shot is an 18-year veteran of the department and a former Navy SEAL.

Tarentino's body was escorted into Boston by multiple police vehicles on Sunday morning, then back to Morin Funeral Home in Leicester.

Tarentino had been with the Auburn Police Department for two years.

Six officers have been fatally shot in Massachusetts since 2000, according to the Officer Down Memorial Page. It's the first fatal shooting of a police officer in Massachusetts since the death of MIT Officer Sean Collier in the wake of the Boston Marathon bombings three years ago.

One person has died after their canoe capsized Sunday morning in North Stonington.

According to the State EnCon police, emergency crews were called to Lake of Isles for a capsized 14-foot-canoe with a father and son aboard around 7:30 a.m.

The son made it to shore safely. The father, a 50-year-old New London man, was reported missing in the water for approximately an hour.

Emergency crews pulled the father from the water around 8:45 a.m. He was pronounced dead at the scene.

State EnCon Police are continuing to investigate.

A person sustained serious injuries when a pickup went down an embankment to a river in Norwalk on Sunday night. 

Firefighters were dispatched to the Norwalk River, off Perry Avenue in Norwalk, at 10:10 p.m. Sunday and found a Toyota Tacoma four-door truck on its side at the edge of the water. 

One man was at the top of the embankment and had minor injuries, but the second man was lying on top of the passenger side of the truck. 

Firefighters and Norwalk Hospital paramedics used a rope system and rescue basket to bring the victim up to the embankment and he collapsed from injuries sustained in the crash, officials said. 

He was transported to Norwalk Hospital to be treated for serious injuries. 

Officials said the truck went off a gravel road along the Metro-North Danbury line and slid down a 70-foot embankment. 

One passenger train passed by the scene at a reduced speed and the trains were halted for 15 minutes while the wrecker crew worked to bring the truck up the embankment. 

A cold pool of air aloft will create some instability tomorrow, which will lead to scattered showers.

Patchy, light rain will move in after midnight, and it will be steadiest in the morning tomorrow.

Scattered showers and storms will continue throughout the day with temperatures stuck in the 60s.

Wednesday and Thursday will be great days, with mostly sunny conditions. Temperatures will rocket into the middle 80s!

More showers and storms are possible Friday, with temperatures in the lower 80s inland.

The Memorial Day weekend forecast challenge is the position of a back-door cold front.

First Alert forecasters are pretty confident the weekend begins warm, and ends cooler.

Temperatures will push 90 degrees on Saturday with lots of sunshine.

There's a chance for a shower or storm on Sunday and Memorial Day, with high temperatures falling back into the 70s.

Police have arrested a 31-year-old man suspected of shooting a man in the head with a pellet gun in Plainfield.

Anthony Mann, 31, of Plainfield, is accused of shooting the 47-year-old victim several times with a high-powered pellet gun.

Police said they responded to a home on South Pine Street around 10:50 a.m. Sunday and found the victim with injuries to his head and arm.

He told investigators he was shot during an altercation and the man who shot him fled in a green Mercury Mountaineer.

The victim was transported to William W. Backus Hospital for treated and police confiscated the pellet gun and Mann's vehicle.

Police said this was an isolated incident and that the victim and Mann know each other. 

Mann has been charged with unlawful discharge of a firearm, second-degree assault with a firearm, breach of peace, criminal possession of a firearm and first-degree reckless endangerment.

He is being held on a 50,000 cash surety bond and is scheduled to be arraigned at Danielson Superior Court this morning.

A nationwide recall of sunflower seeds has been expanded amid continuing concerns over listeria contamination, according to the Food and Drug Administration.

SunOpta, a Minnesota supplier, voluntarily recalled sunflower seeds, snacks and salad toppers earlier this month after a spot check indicated some of the seeds may have been contaminated. The recall also includes some Planter’s brand products. 

The recall was expanded last week to include products made between Feb. 1, 2016 and April 21, 2016, when SunOpta halted production. No illnesses have been reported, according to the FDA.

Affected products were sent to distribution centers in more than a dozen states in March and April and may have been sold nationwide. Kroger and Pittsburgh-based Gold Eagle are among the retailers to sell them.

"SunOpta is committed to ensuring consumer safety and providing quality products and ingredients to customers. The Company has completed its root cause analysis and is working with food safety experts to implement corrective and preventative measures," the company said in a statement. "In an abundance of caution, SunOpta is voluntarily extending the period during which it is recalling a limited number of sunflower kernel products that have the potential to be contaminated with Listeria monocytogenes."

The full list of affected products is available on the FDA's website.

A man accused of sexually assaulting a victim in a Willimantic park in 2010 has been charged with first-degree sexual assault. and first-degree unlawful restraint.

Hector Novoa, 23, of Willimantic, was arrested on Sunday night in connection with an incident police said happened in July 2010 in a wooded area of Lauter Park in Willimantic. when Novoa and the victim were teens.

Bond was set at $100,000 and he’s due in court today. 

It’s not clear is he has an attorney.

Former vice president and climate change activist Al Gore is concerned that a potential Donald Trump presidency could roll back progress in the fight against climate change.  

"He has said some things on the climate crisis that I think should concern everyone,'' Gore said in an interview with NBC's "Today" show. 

Trump has called climate change a hoax created by China.

In the Oscar-winning documentary "An Inconvenient Truth," Gore used charts and graphs to make the connection between increasing carbon emissions and the changing climate.

To mark the 10th anniversary of the film's release on Tuesday, Paramount is offering free downloads of it on Amazon, XFINITY on demand, iTunes and other digital retailers.

Police have responded to the Lordship section of Stratford after the body of a woman was found on a beach on Monday morning.  

Police said the call came in at 9:30 a.m. and the body of a woman, believed to be between 30 and 50, washed up on shore. 

The medical examiner is at the scene.

Officials said it did not appear the woman was swimming. 

Dozens of employees at DiChello Distributors in Orange are on strike amid contract negotiations and businesses the company serves are concerned about the impact it will have on one of their busiest weekends. 

DiChello Distributor distributes beer, including Budweiser, and union representatives for Teamsters Local 443 said they cannot share much information, but the strike started on Sunday afternoon. 

The strike comes just before Memorial Day weekend and liquor store owners and employees are hoping this will not impact sales. 

"Most likely we will not have the products in here. It's gonna be really hard for us to make the sales. Especially those products."

"Most likely we will not have the products in here. It's gonna be really hard for us to make the sales -- especially those products," John Quezada, of the Wine & Liquor Outlet, said. 

NBC Connecticut reached out to DiChello and they said they cannot comment.

In 2011, the union went on strike and it lasted for several weeks. 

A man was hit by a vehicle at West Washington and King streets in Bristol on Monday morning and has been brought to a local hospital to be treated for a serious head injury.

Police were alerted at 10:52 a.m. when a vehicle turning left into West Washington Street hit a man crossing the intersection, police said.

He was brought to a Hartford-area hospital. A female pedestrian walking with him was not struck, according to police. 

Police are investigating and ask anyone with information to call the Bristol Police Department at 860-584-3011.

Police are searching for the man who attacked the clerk at a 7-Eleven in Bristol early on the morning of Friday, May 13 and they have released surveillance photos. 

The 7-Eleven at 200 Riverside Ave. was robbed at 2:14 a.m. and the clerk, Sajjad Sheikh, said the robber hit him in the head with a rock and told him to open the register. 

The robber left with money and Sheikh said he was bleeding all over and went to the hospital. 

The robber was described as thin and 5-feet-8 to 5-feet-11. He was wearing a gray shirt with yellow sleeved and a yellow hood, blue jeans and dark shoes.

The Bristol Patrol and Criminal Investigations Divisions is investigating and anyone with information should call the Bristol Police at 860-584-3011. 

Students and staff at RHAM Middle School in Hebron are on high alert after a threatening message was found in a bathroom on Friday that warned something harmful would unfold at the school on Monday.

The school promised “maximum security” on Monday and state police are trying to figure out who was behind the hateful message.

On Monday morning, parents had to decide whether to send their children to school for the day.

“I’m just feeling very unsettled in trying to make the decision whether to send my daughter to school or not,” Lisa Nolt said on Monday morning.

Porter and other teachers, students and parents received an alert involving RHAM Middle School in which the superintendent warned the community of the threat and laid out what precautions were being taken.  

“Working with the State Police, a plan was developed to provide for maximum security all day Monday. As part of that security plan we have requested that the State Police provide bomb sniffing dogs for a full sweep of the building prior to opening on Monday morning,” Dr. Robert Siminski, superintendent of Regional School District No. 8, wrote.

Michael Bonetti said he is glad the school officials are checking it out.

"I’m not sure what the threat was, I’m told it was a message on a mirror or something. Probably some kid looking for attention I would imagine,” he said.

Even with all the precautions they’re taking, the district “will understand” if parents want to keep their child home from school on Monday, the superintendent said.

“In terms of security, I would argue that today would probably be a safer day to be at school with the increased security. But I have faith in the police and their investigative duties so I would have no problem having my child here today,” Michael Kingsley, a parent, said. 

A Massachusetts man suspected in a home invasion committed in Willimantic nearly 20 years ago is back in Connecticut in police custody.

Jose Manuel Blanco-Dominguez, 57 of Lawrence, Massachusetts, was held as a fugitive of justice in Massachusetts, but Willimantic police took him into custody on Monday.

On Saturday, May 14, Boxborough, Massachusetts police pulled Blanco-Dominguez over after a check of his registration alerted police he had an active warrant against him.

He attempted to provide police with many aliases, but was arrest, police said. 

He is suspcted in an incident on June 25, 1997 in which two men, two women and two children were held at knifepoint at a Windham home.

After a 30 minute standoff with police, three of the masked men were captured.

Blanco-Dominguez eluded police by jumping out of a window and running into the nearby woods.

He has been charged with first-degree burglary, first-degree robbery and conspiracy.

Bond was set at $500,000 and he is due in court on Tuesday.