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By Syed Raza Hassan and Maria Golovnina ISLAMABAD (Reuters) - Pakistani soldiers and paramilitary forces secured the headquarters of the state television channel PTV in Islamabad on Monday after a crowd of anti-government protesters stormed the building and took the channel off the air. Protesters led by opposition leaders Imran Khan, a hero cricket player turned politician, and Tahir ul-Qadri, a firebrand cleric, have been on the streets for weeks trying to bring down the government of Prime Minister Nawaz Sharif. Protests descended into deadly chaos over the weekend, with demonstrators clashing with police in a central area near many government buildings and embassies. The state PTV channel and its English-language PTV World service were taken off the air after protesters stormed its headquarters.