Officials in northwest Pakistan say a bomb planted in a pickup truck has killed at least 25 people and wounded more than 50 others in the tribal region along the Afghan border.

Authorities say the bomb exploded Saturday near a bus stand at a crowded bazaar in Landi Kotal in the Khyber tribal district. Several buildings were damaged in the explosion.

Security officials say the blast appeared to be targeted at members of a tribe allied with the government against the Pakistani Taliban.

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.