Tens of thousands of protesters march on parliament in Pakistan's capital Tuesday, calling for Prime Minister Nawaz Sharif to resign.<br/> <br />Using a crane and bolt cutters, they try to force their way past a barricade of shipping containers and barbed wire...<br/> <br />Which the police and paramilitaries had used to seal the so-called "Red Zone" -- home to parliament and many Western embassies.<br/> <br />The protests are being led by former international cricketer Imran Khan, head of the country's third-largest political party....<br/> <br />As well as Tahir ul-Qadri, who controls a network of Islamic schools and charities.<br/> <br />They're accusing Sharif of corruption and rigging last year's polls.<br/> <br />Police were instructed to try to avoid violence, and did not intervene as protesters removed the first layer of the barricade.<br/> <br />Khan and ul-Qadri -- who hold differing views -- had been holding separate protest rallies in Islamabad since Friday.<br/> <br />But supporters of both men came together for
