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"At least 26 people have been killed in the suicide bombing," top regional administrator Sahibzada Mohammad Anees told AFP. "A suicide bomber on a motorcycle blew himself up in a crowded market," he said.
About 54 people were wounded in the bombing and 37 were still in hospital, some in critical condition, Kurram administrator Shahab Ali Shah told AFP.
"We sent the suicide bomber following attacks on people," Fazal Saeed told AFP by telephone, claiming to be the leader of the so-called Tehreek-e-Taliban Islami.
"We caught a man yesterday who was planting a bomb at a petrol station. We did it in response," he added.