A manhunt is underway for the gunman who was impersonating a police officer and had a list of possible targets, officials said.

A new police report released Thursday says two people killed in a shooting over the weekend on the Las Vegas Strip captured it on video while livestreaming to their shared YouTube channel

Officials say a former student opened fire inside a high school, killing at least 10 people – including nine teens – before taking his own life.

Police say several people have been killed and injured after a shooting at a high school in Graz, the country’s second-largest city.?

The suspect accused of allegedly killing two people on the Vegas strip has turned himself into authorities.

A 36-year-old police officer who was a mother to a young daughter and four-year veteran of the Chicago Police has been shot and killed while on duty in Chicago.

Firearms are now the leading cause of death in children and teens in the U.S.

Two suspects are in custody as authorities in Michigan say a tragedy was averted.

A possible mass shooting plot at a Michigan graduation ceremony was thwarted, authorities said, and police are searching for one of the suspects who remains at large.

The children’s father owned the gun used in the shooting and was taken into custody, according to Phoenix police.

A 9-year-old boy allegedly shot and killed his 5-year-old sister by accident in their Phoenix home, police said.

The Supreme Court ruled unanimously Thursday in favor of U.S. gun manufacturers and blocked a liability lawsuit brought by the government of Mexico.

At least two people were killed, including a police officer, in a shooting in Baldwin Park, California, the Los Angeles County Sheriff's Department said.

At least two people were killed, including a police officer, in a shooting in Baldwin Park, California, the Los Angeles County Sheriff's Department said.

A 7-year-old girl in South Carolina remains in critical condition after she was shot while sleeping in her own home, according to the Pageland Police Department.

The Supreme Court turned away an appeal by a group of gun-rights advocates seeking to overturn Maryland's ban on AR-15 semi-automatic rifles under the Second Amendment.

One person is dead, and 11 others are injured after a mass shooting at a house party in North Carolina, authorities said.

One person was killed and at least 11 others injured early Sunday when gunfire broke out during a house party in Catawba County, North Carolina, authorities said.

At least five people were shot, one fatally, early Sunday when a gunfight erupted between two groups at a large outdoor gathering in Danville, Virginia, police said.

ABC's Ike Ejiochi reports on the urgent search for a suspect in connection to an alleged drive by shooting in Chicago that left seven teenagers injured.

Two people were shot outside a high school graduation ceremony at 3M Arena on the University of Minnesota’s Twin Cities campus Friday night, police said.

Police say two people were shot outside an arena on the University of Minnesota campus after the commencement ceremony for a local high school.

Officers investigated a "shooting into an occupied vehicle stemming from alleged bullying and/or harassment," the San Mateo Police Department said in a statement.

Police announced the arrest of 19-year-old Tajuan Washington.

There are no fatalities at this time, police said.

Two people are dead, and nine others have been injured in a Memorial Day mass shooting in Philadelphia, authorities said.

At least 11 people were transported to the hospital after a shooting in Little River, South Carolina, on Sunday.

At least six people were injured late Saturday in a shooting in Colorado Springs, Colorado, during an argument between multiple individuals, according to police.

At least one victim was hospitalized in critical condition while others injured were in stable condition, according to the Colorado Springs Police Department.

Gunfire erupted in a Jackson, Tennessee, park Saturday night leaving seven people, including juveniles, injured and police seeking the shooting perpetrators.

The front gate at the headquarters was closed until further notice.

Two staff members with the Israeli Embassy were gunned down outside an event at the Capital Jewish Museum in Washington, D.C., on Wednesday in what FBI Director Kash Patel called an "act of terror."

The CIA reported a security incident outside its headquarters, with police saying a driver was shot and wounded after crashing into a gate outside CIA headquarters in McLean, Virginia.

House Speaker Mike Johnson shared his condolences and condemned the shooting that killed two Israeli Embassy staffers on Wednesday night, saying it was “obviously an antisemitic attack.”

Ted Deutch is the CEO of American Jewish Committee, an advocacy group that held the event where the fatal shooting occurred.

Two staffers were killed outside an event at the Capital Jewish Museum in Washington, D.C., on Wednesday in what the FBI believes may be a targeted attack.

Two members of the Israeli embassy staff were gunned down outside an event at the Capital Jewish Museum in Washington, D.C., on Wednesday in what the FBI believes may be a targeted attack.

ABC News’ Pierre Thomas and contributor Richard Frankel report on the investigation into the background of alleged gunman Elias Rodriguez.

One man and one woman were shot and killed in Washington, D.C., the Metropolitan Police Department told ABC News on Wednesday.

Newly released images show the deadly mass shooting at a Las Vegas gym that police say would have been a mass casualty event if the shooter’s gun didn’t jam.

An 11-year-old boy was accidentally shot to death by his sibling inside of their Wisconsin home, police said.

A man in Florida has been arrested for shooting his neighbor’s cow five times after it wandered onto his property, police said.

"We no longer have a threat to the public," Undersheriff Andrew Walsh said.

One person is dead and multiple are injured after shooting inside Las Vegas Athletic Club, according to police.

Two juveniles were arrested and charged with capital murder after allegedly shooting a man and striking him with a vehicle during a carjacking, according to the Austin Police Department.

The 20-year-old student who allegedly opened fire on the Florida State University campus last month, killing two and injuring six, made his first appearance in court.

A New York town official has been arrested for allegedly shooting a DoorDash driver who was lost and trying to get directions, police said.

Police said seven people were hit by gunfire and two others were hurt from flying glass.

A New York town official has been arrested for allegedly shooting a DoorDash driver who was lost and trying to get directions, police said.

At least three people were killed in a shooting at a restaurant in Glendale, Arizona, on Sunday night, according to police.