A suicide bomber has injured as many as 90 people including 50 US soldiers in central Afghanistan.
It is being reported that the attacker, driving a truck, detonated an explosive device at the entrance of a combat outpost.
The Taliban have claimed responsibility for the assault, which blew a six metre hole in the outer wall.
The bombing of Sayed Abad comes on the day that the US military in Afghanistan remembers the 10th anniversary of the events of 9/11.
One month after the attack America launched Operation Enduring Freedom, 100,000 US troops remain in the country.