INGLEWOOD, CALIF. ? A police officer who was videotaped as he slammed a handcuffed teenager onto a car and punched him should be fired, the mayor said Tuesday.

“Based on the investigation he should be fired, no question about it, that’s my opinion,” Mayor Roosevelt Dorn said at a news conference. Outside, dozens of protesters shouted, “No justice, no peace.”

Inglewood, Calif., residents protest inside the Inglewood City Hall against Police Officer Jeremy Morse's abusive treatment of 16-year-old Donovan Jackson, which was recorded on videotape. The mayor of Inglewood, Roosevelt Dorn, on Tuesday said Morse should be fired.

Dorn called for the investigation to finish within 10 days. He said he reached his conclusions after viewing the bystander’s videotape, which has been shown repeatedly on television.

The tape shows Inglewood Officer Jeremy Morse smashing Donovan Jackson, 16, into a car, then striking him in the face during an arrest at a gas station Saturday. Two other officers appear to intervene, with at least one trying to pull away the first officer’s arm.

The mayor said the officer’s actions were criminal and that he should be charged with assault and violating the teenager’s civil rights.

“I’m sure if I looked there are other crimes,” Dorn said.

Jackson

The Inglewood Police Department, the Los Angeles County Sheriff’s Department, the district attorney’s office and the FBI are conducting investigations.

Morse, who has been with the department for three years, was put on leave with pay Monday. The Police Department referred requests for comment to the police union, which has not returned messages.

The Inglewood officers were assisting two Los Angeles County sheriff’s deputies who stopped a car for an expired registration. Police and sheriff’s officials said Jackson lunged at deputies and was combative, while the boy’s father said he cooperated and Morse attacked him unprovoked.

Jackson was booked for investigation of assault on a peace officer. The family’s lawyer, Joe Hopkins, said the teen is developmentally disabled with no arrest record.

Inglewood, a city of 115,000 in southwestern Los Angeles County, has a police force of 211 uniformed officers.