KABUL, Dhu-AlQa'dah 08, 1436, August 23, 2015, SPA -- Three U.S. contractors were among 12 killed by a Kabul bomb that targeted their NATO convoy, the U.S.-led coalition said, making the attack one of the most lethal for U.S. citizens in Afghanistan in recent years, Reuters reported. The suicide attack outside a hospital on a residential street at rush hour killed mainly Afghan civilians and injured scores more, heightening the anger felt in Kabul after a barrage of deadly blasts this month killed dozens. The attacker drove his car towards an armoured pick-up truck belonging to contractor DynCorp International which was torn open and left twisted and blackened by the blast. Dozens of vehicles were destroyed, including a school van. One U.S. contractor died when the bomb exploded, and two died from their wounds, the NATO coalition known as Resolute Support said late on Saturday. It did not name them. The U.S. embassy in Kabul condemned the bombing. --SPA 13:11 LOCAL TIME 10:11 GMT www.spa.gov.sa/w