A man was arrested Sunday after punching another man several times in downtown Portland, pushing him to the ground and stomping on his head, police say.

Christopher James Pflegl, 25, was arrested on suspicion of second-degree assault and booked into jail. The other man was taken to a hospital and treated for serious injuries that didn’t threaten his life, Portland police said.

Officers responded Sunday afternoon to the 900 block of Southwest Fourth Avenue and found the man unconscious and face down on the sidewalk, according to police. He was bleeding heavily from his head and face.

Witnesses told officers that the suspect, identified by authorities as Pflegl, was across the street. He was detained.

Investigators learned Pflegl punched the man several times and pushed him to the ground, causing him to hit his head on the pavement, police said. Pflegl then stomped the man’s head into the pavement, according to police.

The two men didn’t know one another, according to a police spokeswoman. There was a verbal altercation before Pflegl started throwing punches, the spokeswoman said.

Pflegl is being held in the Multnomah County Detention Center on $250,000 bail, records show.

Assault detectives will continue the investigation. Police ask anyone who has information to contact Detective Shaye Samora at 503-823-0768 or shaye.samora@portlandoregon.gov.

-- Jim Ryan; jryan@oregonian.com; 503-221-8005; @Jimryan015

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