NEW : The Pakistani Taliban claims responsibility for the blast . The attack took place in Mardan , a district 50 kilometers ( 31 miles ) north of Peshawar in Pakistan 's Khyber-Pakhtunkhwa province , formerly known as the North West Frontier Province . The suicide bomber was a teen wearing a school uniform . He detonated his explosives in front of students and teachers at an elementary school, killing more than 100 people. The bomber was either carrying the explosives in a bag or wearing a suicide vest .
NEW : The Pakistani Taliban claims responsibility for the blast . The suicide bomber was a teen wearing a school uniform . He detonated his explosives in front of students and teachers at an elementary school, killing more than 100 people. The bomber was either carrying the explosives in a bag or wearing a suicide vest .