A group of Taliban militants have stormed a U.S. military base in Southeastern Afghanistan on Friday.
The incident took place in Paktika Province's Sahra Bagh town near Afghanistan's border with Pakistan.
The Taliban attacked a base in Khost, provincial capital of Paktika province, official said There was no immediate report of troop casualties.
Some unreliable reports indicate that seven people have been killed after a car bomb detonated outside a military base.
A Taliban militant rammed a truck packed with explosives into a checkpoint at a NATO base outside Khost in eastern Afghanistan, local official said.
The attacker drove his truck full of explosives into the first security check post of the NATO base, police said.
Initial information shows that seven policemen have been killed and 13 others injured and there is no report detailing the American casualties.
Five militants who have attacked the base were killed, Nato said in a brief statment.
It is also reported the Taliban claimed responsibility for the attack.
A Taliban spokesman Zabihullah Mujahid, claiming responsibility for the attack, said 10 tonnes of explosives were used in this attack involving a truck. He said heavy casualties were inflicted on invaders.
He said one of their fighters, Shamsullah, had been able to enter the explosive-laden truck into the base, hitting a hotel used by Americans. The bombing enabled other fighters to enter the base. A clash was still ongoing between the Taliban and foreign troops, Mujahid said, claiming dozens of American soldiers were killed and wounded and a military aircraft destroyed.
The clash lasted about 1 hour and foreign troops had banned the movement of people and vehicles in the area.