A suicide bomber attacked a busy area near a police station during a protest in northern Pakistan's Swat district, killing 13 people and wounding 22, police said on Sunday. The blast took place at a crowded intersection near a police station in Swat during a civil society protest, police said. "Thirteen people, including eight police officers, were killed in the suicide bombing," Swat Deputy Inspector General of Police Fida Hussain told AFP. "A suicide bomber attempted to enter the police station located at the chowk (intersection), but was stopped by police at the main gate," he said. The attack took place in Pakistan's northern border province of Khyber Pakhtunkhwa, where authorities are fighting a growing insurgency by the Tehreek-i-Taliban Pakistan (TTP).