least 13 people, officials say.
More than 20 were injured in the blast, which occurredat a bus stand
in Landi Kotal, a town near the Afghan border.
The bomb appeared to be aimed at members of a pro-government tribe who
have formed an anti-Taliban militia.
Landi Kotal is in the Khybertribal agency, part of Pakistan's tribal
north-westwhich has seen frequent attacks by Taliban militants.
The town lies close to the Torkham crossing into Afghanistan.
"The blast was so powerful,it was heard far and wide and caused damage
to nearby buildings," resident Sher Mohammad Shinwari told Reuters
news agency.
The bomb went off at a time when many passengers were at the busstand,
a local official told the BBC.
The death toll may rise as many sustained serious injuries, officials say.
The attack is believed to have been aimed at members of the Zakha
Kheltribe, which has been targeted by militants before.
No group has so far claimed the attack.
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