PITTSBURGH (AP) - One of five Pittsburgh officers involved in a violent arrest recorded by a bystander and posted to Facebook has been assigned to desk duty while the others are working their usual assignments.

Mayor Bill Peduto says Officer Andrew Jacobs will be on desk duty until the city and the district attorney complete reviews of Tuesday's arrest of 47-year-old Daniel Adelman, of Ravenna, Ohio. Jacobs is the officer seen punching Adelman and telling him to "Stop resisting." Police say Adelman was arrested for interfering in another arrest.

WARNING: The video (via WPXI) of the arrest may be difficult for some viewers.

The arrest was recorded outside of PPG Paints Arena.

Adelman was badly hurt. You can see some of those injuries here in his mugshot from that night.

Police say Adelman interfered with the arrest of David Jones, who was wanted on forgery charges. Both men were scraped and bruised after the arrest.

Adelman tells KDKA-TV he was drinking at a concert when he stepped outside to smoke and intervened, believing one officer needed help. He says: "It was probably not the right decision to jump in without knowing the situation."

Adelman now faces charges of obstructing the administration of law, resisting arrest, and public drunkenness.

Police are prohibited from commenting during internal reviews.