A serious clash took place between supporters and opponents of Khyber Pakhtunkhwa Minister for Irrigation Pervez Khattak at the Central Secretariat of Pakistan Tehrik-e-Insaaf (PTI) here in Islamabad on Monday. Pervez Khattak was to announce his joining of the PTI at a press conference along with Imran Khan at the Central Secretariat of the party. Reports said that supporters and opponents of Pervez Khattak came from Nowshera and the venue presented a look of battlefield when they clashed with sticks. On hearing the report of clashes, Imran Khan postponed his scheduled press conference. According to details, a large number of activists of PTI reached the Central Secretariat and they wanted to forcibly evict the followers of Pervez Khattak. Supporters and opponents of Khattak freely used sticks and threw chairs at each other. Several people on both sides were injured. On receiving the information about clash, police reached the spot and dispersed the enraged workers. Opponents of Pervez Khattak said he was a corrupt minister and involved in different corruption cases and they would not allow his entry in the party.