NORTHERN LIBERTIES (WPVI) -- Philadelphia police, including the bomb squad, are investigating an apparent car explosion outside Delilah's club in Northern Liberties.It happened just after 3 a.m. Sunday on the 100 block of Spring Garden Street.Arriving officers and firefighters found a car with a badly damaged hood.Witnesses in Delilah's told police they heard an explosion and went outside to find the damaged car.There were no injuries.