Imran Khan tells BBC: 'State terrorism took place'
3 September 2014 Last updated at 12:13 BST
Imran Khan, who heads the opposition Pakistan Tehreek-e-Insaaf party, has spoken to the BBC's Andrew North about the protests in Islamabad.
Clashes between police and protesters left three people dead and hundreds hurt.
Mr Khan is demanding the resignation of PM Nawaz Sharif who he says "rigged the election".