A bank employee armed with a rifle has shot dead four colleagues and wounded nine other people at his workplace while livestreaming the attack in downtown Louisville, Kentucky.

The attacker was fatally shot at the scene, the Louisville Metro Police Department said, but it was unclear whether he died from police gunfire or a self-inflicted wound.

Police identified the shooter as 23-year-old Connor Sturgeon, who joined the downtown branch of the Old National Bank as a full-time employee last year.

In the latest in a long series of mass shootings in the US, police said they responded within minutes to reports of an attacker at 8.30am on Monday at the bank office near Slugger Field baseball stadium.

Officers fired at the gunman, who was armed with a rifle, police Chief Jacquelyn Gwinn-Villaroel told reporters. The attacker broadcast live video of his attack over the internet, she said.

Police identified the dead as Joshua Barrick, 40; Thomas Elliot, 63; Juliana Farmer, 45; and James Tutt, 64.

Kentucky Governor Andy Beshear, on the verge of tears, said during a news briefing that he knew some of the victims, including Elliot, a senior vice president at the bank.

“He taught me how to help build my law career, he helped me become governor, he gave me advice on being a good dad,” Beshear said. 

“One of the people I talked to most in the world.”

Two police officers were among the nine people wounded, including a 26-year-old recent police academy graduate who was struck in the head and remained in critical condition after brain surgery on Monday, police said. The nine were all treated at the University of Louisville hospital, a hospital spokesman said. Two other victims were also critical.

The status of the shooter’s job at the bank was not immediately clear on Monday. Gwinn-Villaroel said at a news conference that he was employed there. But CNN, citing confidential law enforcement sources, said he had been notified that he would be fired.

According to the Facebook page of the shooter’s mother, Sturgeon grew up in southern Indiana, which is just north of Louisville. The elder of two boys, he attended Floyd Central High School in Floyds Knobs, Indiana, where he ran track and played basketball for the team his father, Todd, coached. He enrolled as a business student at the University of Alabama in 2016.

Sturgeon worked at the bank as an intern for three summers from 2018 to 2020 before becoming a full-time employee in 2022 as a portfolio banker, according to a LinkedIn profile page. He had no prior contact with Louisville police, the police chief said.

“This was a targeted act of evil violence” Craig Greenberg, the mayor of Louisville, a city of 625,000, told reporters at the briefing. Greenberg said he was also friends with Elliot, who had worked on the mayoral transition campaign.

Mass shootings have become commonplace in the United States. So far in 2023, the nation has experienced 146 mass shootings, the most at this point in the year since 2016 – using the definition of four or more shot or killed, not including the shooter – according to the nonprofit Gun Violence Archive.

In one of the most recent high-profile incidents, three nine-year-old students and three staff members were killed at a school in Nashville, Tennessee, by a former student on March 27.

In response to the Louisville bank attack, Joe Biden again reiterated his wish that Congress pass legislation requiring safe storage of firearms, background checks for all gun sales and elimination of gun manufacturers’ immunity from liability.

“How many more Americans must die before Republicans in Congress will act to protect our communities,” the president said in a statement.

By Brendan O’Brien in Louisville