Cleveland police urged a suspect who they said broadcast video of himself on Facebook killing an elderly man on Sunday to turn himself in to authorities.
Officials in the Ohio city said they were looking for Steve Stephens in connection with the one confirmed killing but had found no evidence to support what police said was a claim he made in the video of having killed more than a dozen other people.
"Everybody is out there looking for Steve," Calvin Williams, the Cleveland police chief, told a news conference, where he joined Mayor Frank Jackson in asking Stephens to turn himself in.
"We want this to end with as much peace we can bring to this right now," Williams said, adding police knew of no other victims.
Police said Stephens used Facebook Inc's live-streaming video service, called Facebook Live, to broadcast the killing of the man.