Stephen Marlow, a “person of interest,” is likely armed and dangerous, Butler Township Police Chief John Porter told a news conference.
In a statement Saturday, Porter said authorities were being assisted in the search by the Montgomery County Sheriff’s Office, the FBI and the ATF.
Reports indicate that Marlow may have fled outside of Ohio, the statement said.
The FBI said he had ties to Lexington, Kentucky, Indianapolis and Chicago and may have been in one of those cities.
Porter said Marlow is 5-foot-11 and weighs 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 gunshots just before noon Friday, Porter said, and all four victims died at the scene.
“This is the first violent crime in this neighborhood in recent memory,” Porter said. “We are working to determine if there was a motive for this horrific tragedy or if mental illness played a role.”
“I would never, even in this neighborhood, expect anything, ever,” Chapman told the Dayton station.
Police do not believe there is an ongoing threat to the neighborhood, but have deployed additional teams and the Dayton Police Bomb Squad out of an abundance of caution, Porter said.
Porter said people should call police dispatch if they have any information about Marlow’s whereabouts or if they see the Ford Edge.
Butler Township is a town of just under 8,000 about 9 miles north of Dayton.
CNN’s Zenebou Sylla and Samantha Beech also contributed to this story.