"All seven, who were on foot, were killed on the spot while the militants fled," he added.
The attack happened in Bannu district.
Residents said that Malik Sultan was part of a government-sponsored initiative to form militias in the north-west to combat the Taliban.
Correspondents say the militias are seen as a way of offsetting the fact that the Pakistani army lacks adequate equipment and counter-insurgency specialists. They are also seen as a way of protecting villages and remote communities.
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