Rescuers searching a coal mine in China where 74 people were killed in a gas explosion say they have brought all remaining survivors to the surface.Hundreds of workers were found quickly but at least 60 had been trapped near the scene of the blast. Emergency teams said some of the trapped miners had managed to contact their families on their mobile phones. The blast happened at the Tunlan mine near Gujiao city. It came a day after senior officials held a conference about mine safety, in which they pledged to try to put an end to deadly mining accidents. More than a hundred people were taken to hospital and several were said to be in a critical condition. China’s mining industry is the world’s most dangerous. In 2007 more than 3,700 workers died in gas explosions, floodings and other accidents.