Kabul - A United Nations convoy was attacked by a suicide bomber in southern Afghanistan, close to the Pakistani border, killing two Afghan employees and wounding more than a dozen people, a police official said Sunday.

The bomber drove an explosive-filled vehicle into the UN convoy in Spin Boldak district of southern Kandahar province on Sunday morning, provincial police chief Matiullah Khan said.

He said two Afghan doctors riding in the convoy were killed, and three other officials and at least 12 civilian passersby were injured in the attack which took place in the main market area.

General Abdul Razaaq, border commander for police forces, said the two dead doctors were working with Afghan ministry of public health and were conducting a health survey in the area.

Taliban spokesman Qari Mohammad Yousif Ahmadi denied responsibility for attacking the UN civilian convoy.

Speaking via telephone from an undisclosed location, Ahmadi said that a Taliban fighter named Abdul Salam made a suicide attack on "foreign forces" in the Zanzeer area of the district.

UN spokesmen were not immediately available for comment. (dpa)