The Los Angeles Police Department said it has launched an investigation into a video that an attorney says shows excessive force by police officers.

The video shows police officers responding to a loud Halloween party last year. It shows several officers telling partygoers to back up. At one point, the video shows a group of officers forcibly taking one person into custody.

"As part of the investigation, the Department will review the entire video tape and all the facts of this case and the officers' actions," the LAPD said in a statement. "An Internal Affairs Division review will include taking into account a multitude of critical issues including authority, participation, training, procedures, perception and credibility."