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Police in California now say they'll investigate a video showing a controversial arrest.

Cops were dispatched to a gas station north of San Francisco following a 911 report concerning a man acting "crazy", the station reported.

The cellphone video, captured Friday near a gas station in Vallejo, has sparked accusations of excessive force from multiple witnesses of the incident.

The officer, wearing rubber gloves, mounts the man, punching him in the head and repeatedly striking him with an object that appears to either be a flashlight or a baton.

The owner of the station said that the man was trying to buy a Greyhound bus ticket to Sacramento.

"The kid surrendered", one witness told San Francisco's KPIX 5 News. "The cop, on the other hand, came up right behind and he was exhausted too. He immediately dove on the kid and started whaling on him".

The two appeared to struggle on the ground and the officer - shouting profanities - eventually placed handcuffs on the man. As the crowd comes closer, the officer screams, "Shut up!" The officer later pulls his gun out of a holster, as a crowd standing nearby shouts in outrage. We showed it to police training expert Don Cameron who said, "I think any use of force is tough to watch". "When we're down on the ground, we want to get the person in custody as quickly as we can, and we use personal weapons".

New video footage of a police officer's actions during the arrest of a suspect on Friday is raising questions and causing alarm about the amount of force used against the suspect.

"It does look bad".

Vallejo police said their Internal Affairs department is investigating the incident, and the officer involved will be on leave until the investigation is complete.

"Just like anyone else, officers are innocent until proven guilty", Lt. Jeff Bassett of the Vallejo Police Department said in a statement.

Hall was arrested and booked on suspicion of being under the influence of a controlled substance, resisting arrest, resisting or threatening an officer with force and a probation violation, according to police. "Violence is always ugly but police officers are exposed to violent situations every day and they are required to overcome that violence not just match it".