The U.S.-led coalition in Afghanistan says a suicide car bomber has killed three of its service members in an explosion in the capital.
The International Security Assistance Force did not identify the nationalities of the victims killed when the blast struck a military convoy Friday in Kabul.
Officials say six civilians were wounded in the blast.
The Taliban has claimed responsibility for the explosion, which comes as President Hamid Karzai deliberates over a proposed agreement allowing U.S. forces to stay in the country beyond 2014.
The president says he will not sign the deal until after elections scheduled for next April, and unless the United States agrees to various demands.
Many Afghans concerned about security after 2014 have urged the president to sign the pact.
3 NATO Troops Killed in Afghanistan Blast
1/8An armored vehicle hit by a suicide bomb attack is lifted by a U.S. truck in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
2/8U.S. forces examine the remains of a car after a suicide car bomb attack on the Jalalabad-Kabul road in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
3/8Menteri Pertahanan AS Ashton Carter mengumpulkan para komandan militer dan diplomat papan atas AS untuk membahas perlawanan terhadap ISIS, di Camp Arifjan, Kuwait (23/2). (AP Photo/Jonathan Ernst)
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
4/8Afghan police and U.S. forces respond to a suicide car bomb attack on the Jalalabad-Kabul road in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
5/8Afghan police arrive at the site of a suicide car bomb attack on the Jalalabad-Kabul road in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
6/8Afghan police and NATO forces respond to a suicide car bomb attack on the Jalalabad-Kabul road in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
7/8Afghan policemen arrive at the site of a suicide bomb attack in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
8/8The U.S.-led coalition in Afghanistan says several service members were killed when a suicide car bomber attacked their convoy in Kabul, Afghanistan, Dec. 27, 2013.
The U.S.-led coalition in Afghanistan says a suicide car bomber killed three of its service members in an explosion in Kabul.
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