Four police officers in Oakland, California, were fatally shot on March 21, 2009, by Lovelle Mixon, a convicted felon wanted on a no-bail warrant for a parole violation. Mixon shot and killed two police officers of the Oakland Police Department during a routine traffic stop. After escaping on foot to the nearby apartment of his sister, Mixon shot and killed two police SWAT team officers attempting to apprehend him. Mixon was killed as other officers on the team returned fire.