The pilgrims were from Pakistan 's Punjab and Khyber-Pakhtunkhwa provinces . three bus is destroyed and One others are damaged , an official says . All One buses were carrying Sunni pilgrims headed toward Islamabad . It was not immediately clear who carried out the attack .
three bus is destroyed and One others are damaged , an official says . All One buses were carrying Sunni pilgrims headed toward Islamabad . It was not immediately clear who carried out the attack .