(Adds one killed, Taliban claim of responsibility)
KHOST, Afghanistan, Sept 30 (Reuters) - A suicide bomber rammed a car into a military convoy of foreign forces in southeastern Afghanistan on Wednesday, killing one American, officials said.
The attack occurred as the convoy crossed a bridge in the Mandozai district of Khost province, bordering Pakistan, district chief Wali Shah said.
"One of the cars belonging to the troops is on fire and there are some casualties among them, but at this stage I have no precise information," he told Reuters, adding that a foreign helicopter could be seen evacuating casualties from the scene.
A NATO official said that one U.S. serviceperson was killed by the blast, but gave no further details.
NATO-led forces have been struggling to contain an increasingly fierce Taliban insurgency in Afghanistan.
The Taliban, who were removed from power in a U.S.-led invasion in 2001 and rely on roadside bombs and suicide attacks as part of their campaign, said a member of the group carried out the attack. (Writing by Sayed Salahuddin; Editing by Alex Richardson)