At least 80 people have been buried in a landslide at an iron ore mining area in the southwestern municipality of Chongqing yesterday, according to the local government. Rescuers had pulled out seven injured people, including four seriously hurt, from the debris by 8.30pm, according to the publicity department of Wulong county, the site of the accident. The injured were taken to hospital. Xinhua had earlier reported that those trapped included 50 quarry workers, nine residents and possibly some passers-by. The emergency rescue office of the government in Wulong - a remote mountainous area in Chongqing - received calls for help after the landslide, which happened at around 3pm, buried six households and a quarry in the Tiekuang 'iron mine' town, a county propaganda official who gave her name as Zhu said yesterday. By 5.30pm, three people had been pulled out alive but unconscious, she said. The landslide had alerted the municipal government leaders, and Chongqing Mayor Wang Hongju was sent to the scene to supervise the rescue effort, Xinhua reported. About 500 soldiers, 30 medical staff, ambulances and bulldozers had also been sent to the scene. A Xinhua report said 'millions of cubic metres of rock flooded a valley and buried an iron ore plant and six houses'. It was not clear if any passers-by were injured, it said. Ms Zhu said there had been reports that students were blocked on their way home, but she was not sure if there were any injuries. The landslide had caused an electricity blackout and cut telecommunications in many areas of the town. Ms Zhu said it had been raining for several days, and local media said landslides were common in the Jiwei Mountain region. Tiekuang town lies about 70km southwest of Wulong county, or four to five hours' drive from urban Chongqing, and is rich in coal, aluminium, coal and marble. In September last year, at least 277 people were killed when an iron ore reservoir on a mountainside collapsed in Shanxi province .