Multiple explosions outside the Kabul airport Thursday resulted in “a number of U.S. and civilian casualties” as the U.S. is working to rapidly evacuate Americans and Afghan allies from Afghanistan, the Pentagon confirmed Thursday. “We can confirm that the explosion at the Abbey Gate was the result of a complex attack that resulted in a number of US & civilian casualties,” Pentagon press secretary John Kirby tweeted. “We can also confirm at least one other explosion at or near the Baron Hotel, a short distance from Abbey Gate. We will continue to update.” A U.S. 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 U.S. military were wounded in Thursday's attack, which involved two suicide bombers and gunmen. The official says evacuation flights have continued to take off from Kabul airport in the waning days of an airlift to help people flee the Taliban takeover of Afghanistan. An emergency hospital in Kabul says 30 people wounded in two explosions near Kabul’s international airport arrived for treatment on Thursday, according to the Wall Street Journal and TOLO News, an Afghan broadcaster. Of those taken by the hospital, six were dead on arrival. The Pentagon earlier confirmed “a number of U.S. and civilian casualties” as a result of the two explosions. 📸 @apnews and @gettyimages #afghanistan #breakingnews #kabul