Islamabad, Pakistan (CNN) -- Hashim Khan, an anti-Taliban tribal leader, was killed in northwest Pakistan on Wednesday when a bomb hidden in his car detonated, police said.
Two of Khan's colleagues traveling with him were injured, said police official Abdul Rashid.
The explosion took place at 1 p.m. in Hangu city in Orakzai Agency, one of seven semi-autonomous tribal regions in northwest Pakistan, known to be a hotbed of militancy.
Khan was an influential tribal elder who led a local resistance against the Taliban and its many factions.
No one has taken responsibility for the attack.