Kabul , Afghanistan ( CNN ) -- Three members of NATO 's International Security Assistance Force were killed in an attack in Kabul on Tuesday , the coalition said . Two were U.S. military personnel , and the third was Polish , a U.S. defense official said . The Taliban claimed responsibility for a suicide car bombing targeting a convoy of foreign forces in the Afghan capital , the militant group 's spokesman Zabiullah Mujahid said . A large plume of smoke filled the sky over Kabul , and the U.S. Embassy sounded its `` duck-and-cover '' alarm . Witness Sakhi Ahmad said the explosion took place on Kabul International Airport Road , near the Supreme Court compound . ISAF and Afghan officials are investigating the blast , the coalition said . It did not identify the names or nationalities of those killed . At least 13 Afghan civilians were also wounded in the attack , Afghan Interior Ministry spokesman Sediq Sediqqi said . He said 17 civilian vehicles were damaged in the blast . The explosion in Kabul came a day after a man wearing an Afghan National Army uniform turned his weapon against ISAF members in western Afghanistan on Monday , the coalition said . `` ISAF continues to train , advise and assist the ANSF ( Afghan National Security Forces ) , and does not view these incidents as representative of the positive relationship between our forces , '' ISAF said . Most NATO troops are due to withdraw from Afghanistan by the end of this year as the U.S.-led war effort against the Taliban winds down . The latest violence comes as Afghanistan grapples with the messy fallout from its presidential election this year . Why insecurity , instability and uncertainty loom over Afghanistan . Masoud Popalzai reported from Kabul ; Holly Yan reported and wrote from Atlanta .
NEW : 2 were U.S. military personnel , and the third was Polish , a source says . ISAF says 3 of its members were killed . 13 Afghan civilians are among the wounded . U.S. Embassy sounds `` duck-and-cover '' alarm as sky fills with smoke .