Three people have been killed and 200 hurt in clashes in Thailand's capital, Bangkok, as troops tried to retake areas from anti-government protesters. Soldiers and police fired tear gas and rubber bullets as they advanced after dusk on the red-shirt protesters, who responded by throwing petrol bombs. The army has now called for a truce, saying its troops are retreating. The protesters, who want the government to call new elections, have been camped out in parts of the city for a month. Earlier, the security forces retook an anti-government TV station. Protesters overcame police outside the offices of the People Channel on Friday and temporarily put it back on air. TV footage showed officers shaking hands and smiling with protesters as they retreated. Meanwhile, hundreds of red-shirts are reported to have forced their way into government offices in the northern cities of Chiang Mai and Udon Thani in protest at the government crackdown in Bangkok. 'Explosion' After night fell in the capital, hundreds of soldiers and riot police advanced on a red-shirt camp near Phan Fah bridge and Rajdumnoen road, close to several government buildings and a UN office. Local media reported that both sides were firing weapons and detonating explosive devices. Images broadcast on television showed chaotic scenes, with clouds of tear gas enveloping the streets. Later, hospital officials confirmed that three people had been killed, including a journalist. An earlier offensive near Phan Fah bridge failed to clear the protesters' camp, and left five people injured with wounds caused by rubber bullets. The security forces also unsuccessfully sought to clear another protester camp nearby at the Kok Woa intersection. The army had earlier declared that it hoped to clear out the protesters from one site by dusk, and that it would employ "soft measures and hard measures". Government spokesman Panithan Wattanayakorn said that "if the security officers have to use force, they will do it with caution". The red-shirts - a loose coalition of left-wing activists and supporters of exiled former Prime Minister Thaksin Shinawatra - want Prime Minister Abhisit Vejjajiva to dissolve parliament and call an election. They say Mr Abhisit came to power illegitimately in a parliamentary vote after a pro-Thaksin government was forced to step down. Mr Thaksin was ousted as prime minister in a military coup in 2006. prime minister in a military coup in 2006. They have vowed to defy the state of emergency declared on Wednesday with more rallies. Arrest warrants have been issued for several of the protest leaders. leaders.