Young supporters take their picture with a mobile phone during an anti-government rally in Islamabad. — AP Supporters arrive at the anti-government rally in Islamabad. — AFP A supporter sits on the top of a pole while taking pictures with his mobile phone during an anti-government rally in Islamabad. — AP A young supporter raises a placard during an anti-government rally in Islamabad. — AP Party flashes a 'victory' sign while posing for a photograph during an anti-government rally in front of the Parliament in Islamabad. — AFP Thousands of supporters take part in an anti-government rally in Islamabad. — AP The national anthem during the anti-government rally in Islamabad. — AFP An army helicopter flies overhead during an anti-government rally in Islamabad. — Reuters A supporter holds a sign against Pakistani Prime Minister Nawaz Sharif during an anti-government rally in Islamabad. — Reuters Pakistani opposition leader Imran Khan (Centre) sits with party leaders Jahangir tareen (Right) and Shah Mahmood Qureshi (Left). — AFP A cut-out picture of Imran Khan during an anti-government rally in Islamabad. — Reuters A supporter of Imran Khan, holds a child and a sign against Pakistani Prime Minister Nawaz Sharif. — Reuters Supporters pose as they gather to join a sit-in protest against the government near Parliament in Islamabad. — AFP Supporters gather during the anti-government rally in Islamabad. — AFP Supporters gesture from vehicles while arriving at zero point as they gather to join a sit-in protest against the government near Parliament in Islamabad. — AFP Imran Khan gestures to supporters at the anti-government rally in Islamabad. — AFP