(KUNA) -- Some unknown gunmen Friday killed a cleric and wounded three including two women accompanying him in a drive-by shooting in Pakistani tribal agency, said officials. Unknown masked gunmen opened firing at the vehicle of Pir Lala Khan while was he traveling with his family in South Waziristan tribal agency, bordering Afghanistan, local security officials told KUNA. Firing killed Pir Lala on the spot and critically wounded three including two women and the driver, said officials. They said assailants managed to escape. It was not immediately clear who was behind the attack but authorities said Pir Lala was killed out of old enmity.