The death toll from a landslide in northern China has risen to 56, according to state media. The Xinhua News Agency cited local government official Lian Zhendong as saying rescuers had searched through 70 percent of the rubble by this evening. Xinhua said 35 people were injured, including five who were seriously hurt by Monday's landslide in Shanxi province. The People's Daily newspaper, the mouthpiece of the Communist Party, said on its website that the missing could number in the hundreds. A top work safety official said a preliminary investigation showed that the landslide was caused by the collapse of a dam used as a retaining wall to enclose tailings from an iron mine.