Seven volunteers of an 'Aman Lashkar' or pro-government militia were abducted and killed by militants in the troubled Khyber tribal region.
Their bodies were dumped in Nari area of Khyber, state-run Radio Pakistan reported.
No group claimed responsibility for the killings.
In Kurram tribal region, militants fired indiscriminately at a bus and injured five persons.
Officials of the political administration in the semi-autonomous tribal region said the bus was going from Parachinar, the main town in Kurram, to Peshawar, the capital of Khyber-Pakhtunkhwa province.
The injured passengers were taken to a nearby hospital.
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The Khasadar militia cordoned off the site of the attack and launched a search operation.
Kurram has a large Shia population which has been targeted in the past by militants, including those from the banned Pakistani Taliban.