At least four US-led troops have been killed in two separate attacks in Afghanistan, the International Security Assistance Force (ISAF) says in a statement.
ISAF said on Thursday that three US-led troops were killed by a homemade bomb in the west of the country, while another soldier was killed in the east in a militant attack, Reuters reported.
Earlier on Wednesday, six American soldiers lost their lives in the war-torn country, four soldiers in a single bombing in southern Afghanistan.
A fifth US soldier was killed in another bomb attack in the south and a sixth while fighting Taliban militants in eastern Afghanistan, the alliance said.
More than 150,000 US-led troops have been stationed in Afghanistan and the number has steadily expanded since the US-led invasion of the country in 2001.
Western public opinion is growing increasingly tired of the war and mounting casualties as the conflict pushes into its 10th year.