Stephen Marlow, a “person of interest,” is likely armed and dangerous, Butler Township Police Chief John Porter said at a media briefing.
In a statement Saturday, Porter said authorities are being assisted in the search by the Montgomery County Sheriff’s Office, the FBI and ATF.
Information indicates that Marlow may have fled outside of Ohio, the statement said.
The FBI said he has ties to Lexington, Kentucky, Indianapolis and Chicago and may be in one of those cities.
Porter said Marlow was 5’11” and about 160 pounds, with brown hair. Authorities believe Marlow, 39, was wearing shorts and a yellow T-shirt and fled in a white 2007 Ford Edge.
Authorities have asked anyone with information to contact the FBI. They said Marlow should not be approached.
Police responded to a report of shots fired just before noon Friday, Porter said, and the four victims died at the scene.
“This is the first violent crime in this neighborhood in recent times,” Porter said. “We are in the process of determining whether there was a motive for this terrible tragedy or whether mental illness played a role.”
“I would never, even in this neighborhood, ever expect anything, never,” Chapman told the Dayton station.
Police do not believe there is an ongoing threat to the neighborhood but have deployed additional crews and the Dayton Police Bomb Squad out of an abundance of caution, Porter said.
Porter said people should call the police if they have any information about Marlow’s whereabouts or see the Ford Edge.
Butler Township is a town of just under 8,000 residents about 9 miles north of Dayton.
CNN’s Zenebou Sylla and Samantha Beech also contributed to this story.