A suicide bomber on Sunday killed at least eight people and wounded dozens of other at a building where a Pakistani provincial minister was holding a meeting, an official said.

Punjab home minister Shuja Khanzada was still trapped with several others under the rubble after the blast brought down the roof of the building in the village of Shadi Khan in Attock district, 70 kilometres (43 miles) northwest of Islamabad, said Zahid Saeed.

"The bodies of eight people have been pulled out from the rubble," Saeed, the commissioner of Rawalpindi, told reporters, adding it was a suicide attack.