Federal investigators subpoenaed eight Yonkers police officers Friday in connection to a surveillance video showing an officer slamming a woman to the ground.Officials say the video shows Yonkers Officer Wayne Simoes grabbing Irma Marquez by the waist and throwing her to the floor. As a result, Marquez was knocked unconscious. Marquez is now suing the Yonkers Police Department for $11 million.The incident is under investigation by the Westchester County District Attorney and the U.S. Attorney. Federal authorities are already in the midst of a police brutality probe in the department, stemming from a 2007 bar fight involving Yonkers police officers.Yonkers Mayor Phil Amicone responded to the case, vowing to get to the bottom of it.?I want to know all of the facts,? says Amicone. ?I want to know exactly what prompted anything that happened here.?The mayor says he plans to talk to the police commissioner about Officer Simoes? status on the force. Simoes is currently on active duty.