A truck bomber attacked the headquarters of Italy's paramilitary police in this southern city on Wednesday, killing 23 people, including 15 Italians, and possibly trapping others in the debris. It was the deadliest toll suffered by non-American coalition forces since the occupation began in April, and the first such attack in Nasiriyah, a relatively quiet Shiite Muslim city. The bombing appeared aimed at sending a message that international organizations are not safe anywhere in Iraq. In Rome, Defense Minister Antonio Martino confirmed 15 Italians were killed: 11 Carabinieri paramilitary police, three Army soldiers and an Italian civilian working at the...