At least 10 people were injured in a blast at the election office of a Pakistan Tehreek-i-Insaf (PTI) candidate in Razmak tehsil of North Waziristan tribal district on Tuesday, officials said.

“A huge explosion happened when I was inaugurating my election office in Razmak city,” Malik Aurangzeb Khan, PTI’s candidate from NA-48 in the region bordering Afghanistan, told AFP.

“At least 10 people were injured in the blast,” he said, adding that he could not confirm the nature of the explosion.

A local administration official told AFP on condition of anonymity that an unidentified person threw a grenade at the gathering. A security source also confirmed the attack.