At least one man is dead because of a series of natural gas explosions in Massachusetts. The Essex County District Attorney's office said Leonel Robson was inside his car when a chimney fell on his vehicle after a house explosion. He was taken to a hospital where he was pronounced dead. Lawrence General Hospital says they are treating 13 patients because of the gas fires that erupted in 70 buildings today. At least one was in critical condition. State police tweeted that residents in Lawrence, North Andover and Andover who have gas service from Columbia Gas should evacuate their homes immediately. Officials suspect over-pressurization of a gas main led to many of the explosions.