QUETTA: Unknown gunmen on Wednesday shot dead a prominent politician belonging to the ruling Pakistan Muslim League here, police said. Unidentified attackers on a motorbike ambushed the car of Sher Jan Marri, 32, and fled after shooting him in the provincial capital, said senior police official Qazi Abdul Wahid. No one immediately claimed responsibility for the killing. Marri was a former deputy mayor of Kohlu district where tribal rebels have been active.