PESHAWAR (AFP/APP) - A pro-government tribal leader and vocal critic of militants was killed Wednesday in an ambush near his home in Khyber Agency, officials said. Guli Shah, 60, was a main leader in the Koki Khel tribe. His driver and a bodyguard were also killed and four of his relatives wounded in the attack, a local administration official said. Unknown gunmen shot dead Guli Shah when he was leaving home in his car, Rahat Gul, an official of Khyber tribal district told AFP. Armed with Kalashnikov assault rifles and waiting in another vehicle, the assailants ambushed Shah in a market close to his home, officials said. Shah strongly criticised militants operating in Khyber. He supported and was a tribal interlocutor with the Pakistani government, which has been pressing a two-month offensive against the Taliban in the northwest. Relatives said Shah received written threats from militants and was warned to stop colluding with the government by a militant organisation he initially co-founded, broadcasting on an illegal FM radio station. An intelligence official, who confirmed the killing, said Shah was a founding member of the banned group but later favoured the government and the militants accused him of disloyalty. Wednesdays attack comes eight days after a gunman shot dead Qari Zainuddin, a top rival to Taliban chief Baitullah Mehsud who was increasingly critical of suicide bombings targeting civilians.