ISLAMABAD: A leader of the Pakistan People’s Party (PPP), Azad Kashmir, was killed at a polling station at the FG Model School in F-6/2 during the by-elections on a vacant seat of legislative assembly when activists of a rival political party opened fire on their opponents on Sunday evening, police said. The victim, Captain (retd) Tariq Mehmood, son of Abdul Aziz, of Protha, Khoi Ratta, Azad Kashmir, was the administration officer of the Jammu Kashmir…