Party officials dismiss viral videos as propaganda
Incident took place after Peshawar rally ended on Sunday
Protesters were warned earlier but did not pay heed to notice given by officials
PPP leaders demand the premier to step down
Party MNA Arif Alvi calls for PM's resignation
PPP stages sit-in against federal govt in Mirpurkhas
Railways minister was addressing crowd when slogans were shouted
Khawaja Saad Rafique was addressing the railways’ annual sports event