Ottawa Police Chief Charles Bordeleau says he has not seen the video but he confirmed the force's professional standards section is looking into the incident.
The video, posted to YouTube Saturday morning, shows an altercation between police and a man on Clarence Street in front of Tequila Jacks bar in the ByWard Market Friday night.
The video, shot between 11 p.m. and midnight, shows an officer throwing several punches near a man's head while he and another officer had the man pinned to the ground.
No complaints filed, chief says
The video also shows a large crowd gathered around the altercation, including one man repeatedly saying, "He hit him," to the cellphone camera.
No official complaints have been filed, Bordeleau said Saturday, and he does not know which police officers were involved. He also does not know any context to the incident, such as whether the man was armed before his arrest.
"All we have is a video that appeared on Twitter and I think the prudent thing and the responsible thing for us to do is to put some context into the video and to examine exactly what did take place," Bordeleau said.
Police want any witnesses to the incident to come forward