On 21 December 2004, fourteen U.S. soldiers, four American employees of Halliburton, and four Iraqi soldiers were killed in a suicide attack on a dining hall at the Forward Operating Base (FOB) Marez next to the main U.S. military airfield at Mosul. The Pentagon reported that 72 other personnel were injured in the attack carried out by a suicide bomber wearing an explosive vest and the uniform of the Iraqi security services. The Islamist group Army of Ansar al-Sunna (partly evolved from Ansar al-Islam) declared responsibility for the attack in an Internet statement.