CLEVELAND (AP/KDKA) – Cleveland’s police chief says a manhunt is underway for a suspect they say killed a man and then posted a video of the killing on Facebook.

Police Chief Calvin Williams said Sunday that he’s urging Steve Stephens to turn himself in and not to “do anymore harm to anybody.”

In a statement late Sunday night, Facebook said Stephens posted a video of the killing on Facebook, but did not broadcast it live. Police earlier Sunday had said that Stephens had broadcast it on Facebook Live.

Facebook said Stephens did go live at one point during the day, but not during the killing. It was up for about three hours before it was removed.

In a separate video, Stephens said he also killed more than a dozen other people. Police have not verified that information.

“The past year has been real f***ed up for me,” he says in one of the videos. “I lost everything I had. I don’t have s**t. I’m out of options, and now I’m just doing some murder-type s**t.”

He later says, “I’m going to try and kill as many people as I can over here,” while allegedly sitting outside the workplace of the “love of my life.” He then adds, “This is f***ed up because innocent people about to die today. Hopefully I’m gonna try to kill as many people as I can, get on death row, whatever the case may be.”

Police say Stephens should be considered armed and dangerous. He may have traveled out of Ohio. In a statement early Monday, police warned residents of Pennsylvania, New York, Indiana and Michigan to be on the lookout for Stephens.

CNN cited a law enforcement source who stated that Stephen’s cell phone ping was detected in Erie, Pennsylvania, about 100 miles east of Cleveland. WOIO-TV in Cleveland reported Monday morning that police investigated the ping, and found nothing.

Williams said Stephens may be driving a newer model white Ford Fusion. Anyone with information is asked to call 911.

Officials say Stephens worked for a behavioral health agency. A spokeswoman told reporters that the agency is “shocked and horrified.”

Facebook has released a statement condemning the killing. The company on Sunday called it a “horrific crime,” and said that it works hard to “keep a safe environment on Facebook.”

WOIO spoke with several people who claimed to be family members of the victim, 74-year-old Robert Goodwin Sr. They described the victim as a “good man” who would “give you the shirt off of his back.”

One woman said she felt like her heart was going to stop.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)

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