The explosion occurred near the vehicle of line officer Nawab Shah in Jamrud area of Khyber tribal region, police said.

The explosive device was planted in a motorbike, it said. The dead include police, civilians and at least one child.

Khyber is part of Pakistan's semi-autonomous tribal belt on the Afghan border where security forces are fighting the Pakistani Taliban.

No group claimed responsibility for the attack. Pakistan witnesses frequent bomb and suicide attacks blamed on extremist militant groups and troops have for years been fighting homegrown armed groups in the tribal belt.

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