People gather around the site of an explosion in Beirut's southern suburbs, August 15, 2013

People gather around the site of an explosion in Beirut's southern suburbs, August 15, 2013. Twenty people were killed in the explosion which struck the southern Beirut stronghold of Lebanon's militant Hezbollah group on Thursday, a security source said. An army statement said the cause of the explosion was a car bomb. The blast engulfed several vehicles in flames and trapped many people in nearby buildings which were damaged in the explosion. REUTERS/ Hasan Shaaban (LEBANON - Tags: CIVIL UNREST POLITICS