Kabul, Afghanistan ? Gunbattles in Afghanistan left two U.S. troops and at least one NATO soldier dead, officials said Tuesday, as the Western alliance prepared to assume military command over the country from the U.S.-led coalition.

One NATO soldier was killed and another was presumed dead Tuesday when insurgents attacked a patrol in Kandahar province in southern Afghanistan, a statement by the alliance said.

The Canadian Press reported that two Canadian soldiers were killed and five were wounded while providing security for road construction just west of Kandahar city, but it was not immediately clear if the attack was the one confirmed by NATO.

The two American soldiers were killed during a gunfight with militants Monday in eastern Kunar province, which borders Pakistan, the U.S. military said.