SAN FRANCISCO (KGO) -- A witness captured video of officers punching a man on the ground in the San Francisco's Tenderloin neighborhood on Wednesday.
Police say he was blocking a police motorcade and then began fighting with officers and even trying to bite one of them.
RELATED: SFPD Officer involved in North Beach shooting was involved in separate fatal shooting
Officials say that officer struck the suspect in self-defense. Another officer was injured when someone threw a bottle at him, hitting him in the head and knocking him off his motorcycle.
Officials are still searching for that suspect.
The injured officer is expected to be OK.
VIDEO: Officers struggle with, punch man before bottle attack in San Francisco
More TOP STORIES News