Soldiers and Marines successfully repelled a well-coordinated attack by 40-60 terrorists on Forward Operating Base Abu Ghraib April 2 at about 7 p.m. Abu Ghraib is a detention facility for 3,400 detainees as well as an Iraqi-run prison. In an attempt to gain access to the prison, terrorists launched a simultaneous attack in multiple locations using indirect fires, rocket-propelled grenade fire, small arms fire and a vehicle-borne improvised explosive device. Just as the sun was setting, indirect fire from 81 mm and 120 mm mortars began impacting the operating base. This was followed by multiple RPG attacks and a large volume of small arms fire focused on two guard towers, one on the northwestern and the other on the southeastern corner on the operating base. Using the cover of the mortar fire and the intense fire on the guard towers, the terrorists launched a VBIED to penetrate the perimeter wall near the southeastern guard tower. Marines defending the base returned fire and the VBIED exploded before it reached the perimeter. Marines in the tower were forced to evacuate but were quickly reinforced by a quick reaction force.The terrorists, using residential areas for cover and concealment, then conducted a ground assault towards the southeastern tower. With reinforcements from the quick reaction force, Marines and Soldiers halted the advance of the terrorists. Additionally, Apache helicopters and artillery fire began to engage the remnants of the attackers. The terrorists were forced to withdraw after suffering an estimated 50 casualties. The attack was over by 9 p.m. US forces sustained seven wounded who were evacuated to a combat support hospital and sixteen minor injuries from shrapnel who have been returned to duty. Additionally, thirteen detainees were also wounded from indirect fire, and all detainees remained accounted for.