It's been three weeks since Imran Khan and Tahir-ul-Qadri first called upon their supporters to march on Islamabad's high-security Red Zone, home to parliament and the offices of the Prime Minister. An estimated 50,000 people have continued to rally there, calling for Prime Minister Nawaz Sharif to stand down in what is now regarded as the longest-running protest in Pakistan's history. VICE News went to the Red Zone, where difficult conditions — a police blockade was creating a lack of water, food, and medical supplies — exacerbated clashes between police and protestors that resulted in five protesters being killed by live rounds, and hundreds of people injured on both sides.