Officials in northwest Pakistan say a bomb blast has killed at least six people and wounded 15 in the tribal region along the Afghan border.

Authorities say the bomb exploded Saturday near a bus stand at a bazaar in Landi Kotal in the Khyber tribal district.

No one has claimed responsibility for the attack, but the Pakistani Taliban have carried out hundreds of similar bombings across the country.

The Pakistani Taliban, the Afghan Taliban, al-Qaida and affiliated militant groups are entrenched in the tribal regions and take advantage of the porous border to launch attacks against NATO and Afghan forces in Afghanistan.