Islamabad: Islamabad is under siege as calls for Prime Minister Nawaz Sharif to step down grow louder. Thousands of protesters led by Pakistan Tehreek-i-Insaf chief Imran Khan and cleric Tahir-ul-Qadri have reached Pakistan's Parliament in the heavily fortified 'Red Zone', which is Islamabad's diplomatic enclave.

Source: http://ibnlive.in.com