Bilawal Bhutto Zardari, chairman of Pakistan Peoples Party (PPP), waves to supporters from a helicopter as he arrives for a public gathering in southern Pakistani port city of Karachi on Oct. 18, 2014. Tens of thousands of PPP supporters gathered in Karachi to hear Bilawal Bhutto Zardari, the son of the country's slain premier Benazir Bhutto, on the formal launch of his political career. (Xinhua/Arshad)