Syed Riaz Hussain Shah, who headed the PPP chapter in Kurram tribal region, was gunned down in Dabgari area of Peshawar this afternoon, authorities said.
No group claimed responsibility for the attack though police officials and PPP insiders said they believed Shah was targeted by militants.
Kurram, a Shia-majority tribal district, has for long been troubled by clashes between rival Shia and Sunni tribesmen.
The two sides agreed to a ceasefire last year but the truce has been violated several times.
