Tear gas hovered over the streets of Islamabad, as sporadic clashes broke out across again the Pakistani capital.<br/> <br />Protesters have paralyzed city streets, trying for weeks now to bring down the government of Prime Minister Nawaz Sharif.<br/> <br />Theyr'e angry over last year's election that swept him back into power, saying the results were fraudulent.<br/> <br />The protesters are led in part by opposition leader Imran Khan, a hero cricket player turned politician.<br/> <br />Khan had earlier apologized for his supporters after they stormed the building of a state TV broadcaster.<br/> <br />But as evening fell and the clashes subsided, Khan again urged Sharif to stand down, using cricket to send his message.<br/> <br />(SOUNDBITE) (Urdu) OPPOSITION LEADER, IMRAN KHAN, SAYING:<br/> <br />"Your inning is over. Why aren't you going back to the pavilion? Why are you showing stubbornness?"<br/> <br />The government tell Reuters it's preparing to launch a selective crackdown against the protesters.<br/> <br />It's warning t
