At least 20 people were killed Friday when a bomb exploded at a mosque in north-western Pakistan, an official and news reports said.
The attack was carried out in the Ghandi area of Jamrud in Khyber Agency, one of the seven tribal districts along the Afghan border, after Friday prayers.
At least 20 people were killed, Mujahid Khan, of the Edhi ambulance service, told the German Press Agency dpa.
Broadcasters Dunya TV and Geo report the same death toll.
Fazal Mehmood Shah, a local official, confirmed the attack. "It was a powerful blast and we are trying to know the death toll," he said.
Details of the explosives were not known, but Geo TV quoted a witness as saying that a bomb had been planted.
There are also reports that the roof of the mosque collapsed after the explosion.