Five of those killed in the blast in the Bajur region were members of the security forces, including one who had received an award for bravery in fighting Islamist militants, the government administrater Abdul Haseeb said. The others were passers-by. At least 40 people were wounded.
The Pakistani Taliban or allied groups will be suspected in the attack. The group, which is battling for control of the region, has killed and wounded thousands of people since 2009, many of them civilians in markets or mosques.
On Thursday, the US released 17 letters seized from the compound of Bin Laden by US special forces after they killed him a year ago.
Two senior al-Qaida leaders wrote a letter to the Pakistani Taliban chief, Hakimullah Mehsud. in December 2010, criticising the group for carrying out attacks in markets, mosques and other places, killing innocent Muslims. It accused the group of making "clear legal and religious mistakes which might result in a negative deviation from the set path of the jihadists' movement in Pakistan".
The group's actions "are contrary to the objectives of jihad and to the efforts exerted by us", said the letter, which was written by Abu Yahya al-Libi and a militant leader identified as Atiyatullah.
