 Mark Fouser, WDEL, Delaware's News Radio. The Maryland Fire Marshal's Office looking into the cause of an overnight fire at Captain Zach's Crab Shack south of Elkton. Firefighters from Singley and Newark responded to the fire around 4 o'clock this morning. The facility is located behind Sarge's Market. The market was not damaged, but crews remained on 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.