"There has been a twin suicide bombing in the Spin Boldak council building. The blasts were inside the hall during a meeting of tribal elders," Jawed Faisal, spokesman for the governor of Kandahar province, told AFP.

"There are casualties but we don't have the numbers at this time."

Witnesses said that two explosions were heard, followed by small arms fire in Spin Boldak, a town in the restive Kandahar province close to the border with Pakistan.

The council building was badly damaged and some people were feared trapped in the rubble.

"Every Sunday the local shura (council) meet at the administrative building, that is where the attack happened," said Mohammad Ali, the border police chief in Spin Boldak, 100 kilometres (60 miles) south of Kandahar city.

"Two suicide attackers detonated themselves during the meeting."