At least seven people, including three children, have been killed by a roadside bomb near a Shia Muslim procession in north-western Pakistan.
The blast, which also wounded 30 people, happened in the city of Dera Ismail Khan, a stronghold of Sunni Muslim militant groups, according to local police.
More attacks are feared in the coming days as the minority Shia Muslims prepare to observe the holy day of Ashura on Sunday, the climax of the holy month of Muharram.
No one claimed responsibility, but the suspicion fell on Pakistani Taliban, who have carried out such attacks previously.
Ashura commemorates the death of Imam Hussein, the Prophet Muhammad's grandson, in the 7th century. The Sunni-Shia schism over Muhammad's rightful heir dates back to that time.