A bomb has killed at least seven people in the north-western Pakistani tribal region of Bajaur.
The explosion tore through a busy market in the Salarzai area, leaving more than 20 others injured.
It is not clear who carried out the attack.
Bajaur borders the Afghan province of Kunar where the Taliban have strongholds.
Correspondents say the militants have often attacked anti-Taliban tribal militias in the Salarzai area.