Beirut , Lebanon ( CNN ) -- NEW : Hezbollah leader Hassan Nasrallah is scheduled to address a large rally . The Lebanese army says a car bomb caused the blast . Comment: The area is a Hezbollah stronghold .
NEW : Hezbollah leader Hassan Nasrallah is scheduled to address a large rally . The Lebanese army says a car bomb caused the blast . Comment: The area is a Hezbollah stronghold .