On August 19, less than two weeks after a bombing at the Jordanian embassy in Baghdad kills 14 people, a massive truck bomb destroys part of the United Nations headquarters in Baghdad. At least 17 people are killed, including Brazilian Sergio Vieira de Mello, U.N. Special Representative to Iraq. No group claims responsibility for the bombing. Following the attack, most UN workers are pulled out of Iraq. As security deteriorates, other aid organizations leave Baghdad as well.