The suspected shooter was a 20-year-old from Dayton, Beavercreek police said.
Four people were injured after a man walked into a Walmart in Ohio with a rifle and started shooting, police said.
Authorities said the incident happened around 8:36 p.m. ET Monday in Beavercreek, about 10 miles southeast of Dayton.
The shooter was found dead inside the store from an apparent self-inflicted gunshot wound around 8:42 p.m. by a responding officer, Beavercreek police said.
The victims were transported to area hospitals, three in critical condition and a fourth with non-life-threatening injuries, police said. One victim is still in critical condition Tuesday afternoon, while the rest are stable, police said.
All four victims – three women and one man – were shopping in the store at the time of the shooting, police said.
The suspected shooter was identified by Beavercreek police as 20-year-old Benjamin Charles Jones of Dayton.
“The FBI is currently looking into the shooter, his background, his motivation,” Zrinka Dilber, the assistant special agent in charge of the FBI’s Cincinnati Field Office, told reporters during a news briefing Tuesday. “We are very, very early in this process.”
Beavercreek Mayor Bob Stone applauded the quick response to the shooting, saying it “undoubtedly saved lives and minimized the impact of this devastating event.”
“It’s always one of those things where you don’t think it could happen in your community. So anytime it does, it’s shocking. It’s tragic,” Acting Beavercreek Police Chief Chad Lindsey told reporters .
Walmart released a statement to ABC News saying the company was “devastated.”
“We are devastated by what has happened at our store in Beavercreek, Ohio,” the company’s statement read. “This remains a developing situation and we are working closely with investigators on the scene.”
Bureau of Alcohol, Tobacco, Firearms and Explosives; Ohio Bureau of Criminal Investigation; The FBI and other local agencies were on the scene Monday evening assisting Beavercreek police with the investigation.
ABC News’ Matt Foster, Darren Reynolds and Sasha Pezenik contributed to this story.