Kabul explosion: US officials call it 'suicide attack', believe ISIS to be behind blast

A US official says the complex attack outside Kabul airport is definitely believed to have been carried out by the Islamic State group. The official says members of the US military were wounded in Thursday's attack, which involved two suicide bombers and gunmen. The official spoke on condition of anonymity to discuss ongoing operations. The Islamic State group is more radical than the Taliban and has carried out a wave of attacks.