MULTAN,June 5th: A vehicle of Prime Minister's younger son Syed Moosa Gilani turned turtle on way to Jal;alpur pirwala on Saturday morning, resultantly his driver Tariq Ali and a PPP worker, Riaz Ahmed died.Police said," the vehicle capsized due to overspeeding and it was going to Jalalpur pirwala from Multan," Moosa Gilani was not in this vehicle because he was supervising the bypoll in PP-206(Jalalpur Pirwala) where his uncle Syed Ahmed Mujtaba Gilani was contesting against the PML-N nominee Begum Naghma Mushtaq Lang.Police said that this vehicle was being used for electioneering.