An Iraqi official says an explosion from a bomb attached to the underside of a minibus has killed four people and injured five others south of Baghdad. Maj. Muthana Khalid, the spokesman of Hilla provincial police, said Tuesday that the sticky bomb blew up late on Monday as the minibus was travelling in Haswa, 30 miles (50) kilometers south of the Iraqi capital. He says two policemen who were guarding the road were among the dead.