At least 21 people have been killed by a suicide bomber who blew himself up outside a Shiite mosque in north-western Pakistan as worshippers were leaving Friday prayers.
Thirty-six were injured in the latest apparent sectarian attack in the country.
Shiite Muslims in Pakistan have increasingly been targeted by radical Sunnis who consider them heretics, and 2012 was the bloodiest year for the minority sect in the country's history.
Most of the dead and wounded in the attack on the mosque in the town of Hangu in Khyber Pakhtunkhwa province were Shiites, but some of the casualties were also from the country's majority sect since there is a Sunni mosque nearby.
Hangu has experienced conflict in the past between the Sunni and Shiite communities that live in the town. Both sides have attacked each other's shops and burned them.
The worst sectarian violence in Pakistan in recent years has been in south-western Baluchistan province, which has the largest concentration of Shiites in the country. A twin bombing last month at a billiards hall in the provincial capital, Quetta, killed 86 people, most of them Shiites.
According to Human Rights Watch, more than 400 Shiites were killed in targeted attacks in Pakistan in 2012, including over 120 in Baluchistan.