police from all over the area concerned. >> chris gordon is live in alexandria with the latest on this story. chris? >> reporter: pat and jim, this is the latest target of the 7-eleven serial robber, it's in a posh section of alexandria surrounded by residences, restaurants and offices. these 7-eleven robberies are strikingly similar to a string of crimes that prompted an fbi investigation just last year. in september of 2015, we reported on the fbi investigation into serial armed robbers striking 7-eleven stores in northern virginia, maryland and the district. as many as four individuals entered the stores, one was armed with a long gun. the fbi worked that case in cooperation with local police. now another string of 7-eleven robberies is plaguing our area. six convenience stores have been robbed in prince george's county since december 21st. a single gunman is believed responsible. police sent us this video of the man wearing a mask and black