Unidentified assailants opened fire at peace committee leader Sherpao Mehsud's vehicle.
The injured were shifted to a nearby hospital immediately.
Earlier last year, at least two members of a local peace committee were also killed in a blast in Tirah Valley.
Read: Two peace committee members killed in Tirah valley blast
The deceased belonged to Tawheed-ul-Islam (Zakha Khel Peace Lashkar) and were identified as Qalat Khan and Khabar Shah.
The volunteers were moving ahead to capture the vacated post of the banned Lashkar-e-Islam (LI) when the bomb exploded.
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