Pakistan Tehreek-e-Insaf (PTI) has not withdrawn its demand regarding resignation of Prime Minister Nawaz Sharif, said Shireen Mazari on Saturday. In a press statement, PTI spokeswoman Mazari made it clear that all demands being made by her party were constitutional and that there was no change. "Participants of the Azadi march will leave Islamabad only after their demands are met," she stated. Dr Mazari said that Shahbaz Sharif was directly responsible for Model Town tragedy and Gujranwala clash.