 Maryland Fire Marshal investigators looking into the cause of an overnight fire at Captain Zach's Crab Shack south of Elkton. Firefighters from Singerley and Newark responded to the fire just before 4 a.m. The facility is located behind Sarge's Market. The fire did not extend to the market, but crews remained on the scene for several hours while a 500-pound propane tank was allowed to burn off. At this point, investigators say there's no sign the fire was intentionally set.