Two men were killed and five others injured in an explosion that ripped through a video hall in southern Somalia, a police official said Friday. The explosion late Thursday went off as more than 100 young men watched a film in a small video hall in Baidoa, a town 250 kilometers (155 miles) southwest of the capital, Mogadishu, said Aden Bid, a senior police officer. «It could be a hand grenade but we are investigating the cause of the explosion and those behind it,» Bid was quoted as saying by the Associated Press.