Two suicide bombers dressed in burqas struck a crowd of displaced people collecting aid handouts, killing at least 32 and wounding more than 50, on Saturday at a camp located 30 kms from Hangu city in North West Frontier Province (NWFP) in Pakistan.
"The toll in the two suicide attacks is 32 dead and more than 50 wounded," local police chief Dilawar Khan Bangash said.
The bombers struck minutes apart in the Kaccha Pakka camp on the outskirts of the garrison city of Kohat, a registration centre for people fleeing Taliban violence and Pakistani army operations close to the Afghan border.
Body parts of the bombers were recovered. Most of the victims were members of the Mani Khel and Baramad Khel tribes who had gathered for registration after fleeing fighting in their home district of Orakzai, he said.
"The two tribes raised a lashkar (tribal militia) to fight Taliban in Orakzai," he said adding that security forces suffered no casualties.
Bangash said the first bomber detonated his explosives while displaced people gathered to register and receive relief items. A few minutes later, the second bomber blew himself up in the middle of the gathering crowd.
Security forces cordoned off the area and an emergency was declared in hospitals.
About 300 internally displaced people were living in the relief camp.
Pakistan's latest military offensive and ongoing extremist violence have displaced at least 210,000 people from the tribal districts of Orakzai and Kurram, most of whom have registered in Kohat and Hangu towns.
On Saturday, army chief of staff, General Ashfaq Kayani, made a rare public apology over the "unfortunate" deaths of civilians during military action last week in the Khyber tribal district.
Military officials initially said at least 42 militants were killed in a gunfight and two air strikes in the Tirah valley, but tribesmen later said dozens of civilians were killed last Saturday.
(With PTI inputs)