The authorities said the suicide bombing, which killed at least 14 people in the Swat Valley. The Pakistani Taliban claimed responsibility. At least 14 people were killed in a suicide bombing outside a police station in northwestern Pakistan on Sunday evening, officials said, the worst attack in a surge of militant violence that has reignited fears in a region once dominated by the Pakistani Taliban. The attack took place in the Swat Valley, in Khyber Pakhtunkhwa Province, as residents and civil society activists gathered near the police station for a peace rally to protest the recent rise in attacks. Pakistan’s interior minister, Mohsin Naqvi, said that police officers had “sacrificed their lives to stop the suicide bomber from entering the police station,” averting a much higher casualty toll.