Wilmington Fire Department crews worked overnight after a liquid propane (LP) tank leaked behind a home on Echo Lane in Wilmington. Officials decided the safest strategy was to burn off the remaining LP in the tank, and that the process was completed shortly before 6 a.m. Wednesday. Crews left the scene at approximately 6:30 a.m. According to Assistant Fire Chief Sammy Flowers, the leak was caused Tuesday afternoon around 3:30 p.m, when a small backhoe accidentally hit a pressure relief valve on the tank. That caused the tank to release the LP into the air.