Imran Khan, chairman of Pakistan Tehreek-e-Insaf (PTI) political party, gestures as he leads the Freedom March in Lahore in this file picture taken August 14, 2014. Photo: Reuters
Imran Khan's opposition party in Pakistan says it has decided to resign all its seats in the national assembly.
A senior member of party said they were trying to force Prime Minister Nawaz Sharif to step down.
The Pakistan Tehreek-i-Insaaf party has 34 seats in the lower house of the parliament, making it the second biggest opposition group.
Correspondents say Khan wants the PM Sharif to resign because he accuses him of rigging elections last year.