The death toll from the massive explosion at a sprawling coal mine in West Virginia rose to 25 early Tuesday, making it the deadliest U.S. mining disaster in 25 years. Crews halted their efforts to reach four miners still unaccounted for at the Upper Big Branch Mine following the blast Monday afternoon. Concentrations of methane and carbon monoxide inside the mine made it a safety risk for crews to proceed, said Kevin Stricklin of the U.S. Mine Safety and Health Administration at a 2 a.m. briefing to reporters. Officials planned to drill bore holes from the surface 1,200 feet into...