The police tried to stop anguished relatives from streaming into one of the worst affected areas of China's massive earthquake on Sunday, as another strong aftershock hit the area and the death toll rose to nearly 32,500. Hundreds of aftershocks have rattled Sichuan province following last Monday's devastating 7.9 magnitude quake, and officials are concerned the tremors could bring down more unstable buildings and rupture already leaky dams. Six days after the main quake hit, the overall death toll stands at nearly 32,500, state news agency Xinhua reported, with a further 220,000 injured. Early on Sunday, a 6.1 magnitude tremor caused thousands to flee swaying buildings in the provincial capital, Chengdu, some 200 km south of the new tremor's epicentre. The official Xinhua news agency said there had been no reports of casualties, but more roads been seriously damaged. But concerns over the safety of nuclear facilities, including China's chief nuclear weapons research lab, close to the affected zone were allayed. Xinhua reported that they were "all in a safe and controllable state". In Beichuan, hard hit by the quake and which many people fled on Saturday following warnings a dam may collapse, worried relatives quarrelled with the police who tried to prevent them entering the area, citing safety reasons. "I don't think the dam is a big threat, and anyway, there's nothing I can do. I have to keep searching," said Mr Fu, who works as a truck driver and has spent days desperately searching though rubble and shouting out his daughter's name. Rescue work has been complicated by bad weather, treacherous terrain and hundreds of aftershocks. But victims are still being pulled alive from the rubble. In Yingxiu, close to the epicentre of Monday's 7.9 magnitude quake, at least 56 people were rescued over the past 24 hours, the official Xinhua news agency said on Sunday. An estimated 10,000 people or so are still trapped under the rubble, but most are believed dead. Dozens of schools collapsed in the area, crushing to death thousands of children taking classes at the time. Officials pulled out more bodies from the wreckage of the local primary school in Beichuan on Sunday. Forty-one corpses were laid out in front of the school. Yet Fujiya Koji, head of the Japanese rescue team in Sichuan, said that chances of finding more sur vivors were low. "We haven't been able to find any survivors yet. Generally by this stage the likelihood of survival is low. They say they have been finding some in Beichuan and we'll certainly keep trying," he added. Meanwhile, a "slightly bruised" man was pulled out alive from a collapsed hospital on Sunday after being trapped for 139 hours by China's massive earthquake, a state news agency reported. The official Xinhua News Agency said Tang Xiong was pulled to safety from the collapsed hospital in Beichuan in the northern part of Sichuan province. It said Mr Tang "was only slightly bruised and in his right senses" when he was found.Experts say that buried earthquake survivors can last a week or more, depending on factors including the temperature and whether they have water to drink, but that the chances of survival diminish rapidly after the first 24 hours. Also, the Beijing Olympic torch relay will be halted for three days as part of a national mourning period following a devastating earthquake, Games organisers said on Sunday.