Taliban, claimed responsibility for the attack in Gardez, the capital of eastern Paktia province.

"A suicide bomber tried to attack the base with a truck bomb but he was encountered at the first gate by Afghan guards. He set off his bombs there," Paktia provincial police chief, Abdul Ghafar Sapai, told AFP.

Two local guards and a border policeman in a nearby police base were wounded, Sapai said. He said the distance between the first barrier and the main gate was more than 100 meters.

The police chief said "good security measures", including anti-blast concrete blocks, stopped the attacker from reaching his target and causing more casualties.

The base houses small groups of troops and civilian experts who are trying to help rebuild the war-torn country and enhance security. The groups are known as Provincial Reconstruction Teams (PRT) and are assigned across Afghanistan.

The PRTs are run by various Western nations as part of NATO's US-led International Security Assistance Force mission in Afghanistan. The Gardez PRT is run by the United States.

ISAF headquarters in Kabul could not give immediate information.

Taliban spokesman Zabihullah Mujahed, contacting AFP from an undisclosed location by telephone, said one of their fighters drove a bomb-laden car into the entrance of the base and detonated the explosives.

Mujahed said that dozens of US and Afghan troops were killed and wounded.

Copyright AFP (Agence France-Presse), 2011