VIDEO: York police said a registered sex offender has been arrested after showing up to emergency scenes pretending to be a firefighter. Robert Shipman, 29, was arrested Saturday after officers said he blocked the roadway at a serious accident on East Jefferson Street and had red lights on his truck. Officials said Shipman arrived before they did and had already blocked the street with his pickup truck. Firefighters lost time getting to the injured victims because they had to get around him first. York Fire Chief Domenic Manera told Channel 9's South Carolina bureau reporter Greg Suskin that he met Shipman face to face at another accident scene two days earlier. Police said Shipman was on East Liberty Street where a car had run into a brick wall in front of the Lowe’s store, seriously injuring the driver.