The Taliban say three US soldiers have been killed and two others wounded in a blast in Afghanistan's western province of Farah.
On Thursday, the Taliban said the soldiers were on patrol when their tank was hit by a roadside bomb.
The US military has not commented on the claim yet.
According to the website icasualties.org,
at least 3,360 foreign soldiers including 2260 US soldiers have been killed in Afghanistan since the US-led invasion of the country in 2001, which was conducted as part of the so-called war on terror.
The offensive removed the Taliban from power, but insecurity remains across Afghanistan, despite the presence of foreign troops.
A total of 402 US-led soldiers lost their lives in Afghanistan in 2012. However, 2010 remains the deadliest year for US-led military casualties, with a death toll of 711.
There has also been a sharp increase in civilian casualties in Afghanistan in the first half of 2013.
The United Nations Assistance Mission in Afghanistan (UNAMA) said in a report on July 31 that civilian deaths were up 23 percent in the six months from a year ago.
From January to June, the number of civilians killed in war-related incidents rose to 1,319 from 1,158 a year earlier. In the same period, 2,533 civilians were injured, compared with 1,976 in 2012.
The report blames the rise in civilian fatalities on escalated fighting between Taliban militants and government forces.