Rescue teams are working to free six miners trapped after a tunnel in a coal mine gave way in the western US state of Utah, local authorities said. The collapse at the Genwal mine at about 0400 (0900 GMT) was so powerful it was mistaken for a small earthquake. Scientists later said a 4.0 magnitude seismic recording was actually caused by the disturbance at the mine, the Associated Press news agency said. The mine is 140 miles (225km) south of Salt Lake City.
Emery County sheriff's office said: "Rescue workers are on scene trying to locate six miners that are unaccounted for." No contact had yet been made with the miners, who were thought to be 1,500ft (457m) below ground.