A protester holds a sign as people rally for 17-year-old Laquan McDonald, who was shot 16 times by Chicago Police Department Officer Jason Van Dyke last year in Chicago. McDonald lived a troubled life and had at least one previous brush with the law.

CHICAGO — Newly released videos from four additional police vehicles at the scene of the 2014 shooting of Laquan McDonald raise questions about how the city’s Police Department documented the killing of an African-American teenager that has led to a Chicago police officer being charged with first-degree murder.

The police dashboard camera videos also shed new light on how the events unfolded leading up to McDonald’s death by showing police response to the incident from new perspectives. That includes from the vehicle Officer Jason Van Dyke rode in as he briefly followed McDonald, 17, before shooting him 16 times in the middle of a road on Chicago’s Southwest Side on Oct. 20, 2014.

Mayor Rahm Emanuel’s Law Department released the videos from five separate police vehicles to the Chicago Tribune in response to an open records request. The videos, released on DVDs, included the one widely circulated publicly Tuesday that shows the most complete coverage of the shooting released.

The videos show at least eight police vehicles at the shooting scene, and the Emanuel administration has released videos from five of those vehicles. But no video has been provided from the other three vehicles, which were at the scene as the shooting unfolded.

Police, prosecutors and the mayor’s office have not responded to questions about whether those vehicles had cameras.

Chicago Police Department orders require officers to use in-car video cameras if the vehicle s are equipped with them. According to that order, the in-car video system will automatically engage audio and video recording when the vehicle’s emergency lights are activated. Officers may also manually engage the recording system without activating the lights.

The question of why there is so little discernible sound on any of the videos is an issue that city officials have yet to address.

The videos, including the one from Van Dyke’s vehicle, did not include any audio of officers talking, either in the vehicles or over police radios, raising questions about why sirens outside the vehicles are audible but voices and other sounds from inside the vehicle are not.

Cook County State’s Attorney Anita Alvarez and the city Law Department did not respond.

However, in a news conference before releasing the video that shows McDonald’s shooting, Chicago Police Superintendent Garry McCarthy was asked whether there was any audio.

“No, there was no audio with the tape that I saw, the video I saw,” McCarthy said. “I don’t think that audio does exist.”

Asked whether the police cameras were supposed to have sound, McCarthy responded, “There’s supposed to be (audio), and it’s supposed to happen at a couple different instances.

“This is one of the things that we are working on. Sometimes we have technical difficulties,” McCarthy said. “Sometimes officers need to be disciplined if they don’t turn it on at the right circumstance, which is why we are working out all the details.”