A suicide bomber has killed 23 people, many of them believed to be militants, in an attack on the base of a rival insurgent group in Pakistan.
The bombing took place in the Tirah Valley region close to the border with Afghanistan.
The target of the bombing was the base of the Lashkar-e-Islam group, said an official.
It was not clear how many of those killed were militants and how many were civilians.
A commander of the Pakistani Taliban, which is a rival of Lashkar-e-Islam, claimed responsibility for the attack in a call to the Associated Press.
Both groups have been fighting for control of the Tirah Valley.