A suicide bomber has killed 19 mostly Sunni Muslims and wounded 45 in a crowded market outside a mosque in Pakistan's northwestern town of Hangu.
Hangu, part of Pakistan's border region with Afghanistan, has been racked by sectarian violence between Sunni and Shia tribes.
It is just a few kilometres from Parachinar, which has a significant Shia population against whom hardline Sunni militant groups have launched attacks for years.