At least 21 people were killed when a gas cylinder exploded at a religious gathering in Swat valley on Thursday, officials said.
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"According to initial reports it was a gas cylinder blast," another senior police officer Gul Afzal Afridi told AFP.
There were around 1,500 people listening to the speech of a Muslim cleric at the centre when the cylinder exploded, he said.
A bomb disposal unit has been summoned to investigate though there was no sign of any explosives at the blast site, he added.
