The US has struck at Iraqi insurgents hours after Wednesday's suicide bomb attack at an Italian base in Nasiriyah, and destroyed a warehouse in Baghdad. The US soldiers also chased Iraqis who were seen firing mortars. A suicide bomber blew up October 12 a truck packed with explosives at an Italian paramilitary base, killing at least 26 people. The attack was the deadliest against an US ally since the occupation began and appeared to send a message that international groups are not safe anywhere in Iraq. The blast wounded 79 people, 20 of them Italians, hospital sources and Italian officials said.