Iraqi officials say a late night rocket attack on Baghdad's heavily fortified Green Zone has killed four Iraqis and wounded 10, AP reported. A police officer says militants fired a Katyusha rocket late Monday night, noting that the rocket hit a residential complex for laborers working at a hotel and sparked a fire. A doctor at a nearby hospital confirmed the causalities. The sprawling Green Zone houses Iraqi government headquarters and the U.S. and British embassies.