West Virginia coal mine explosion
State troopers stand watch at the entrance to the Massey Energy Co.'s sprawling Upper Big Branch mine, Thursday, April 8, 2010, in Montcoal, W.Va. Rescue crews began working their way by rail car and on foot through a West Virginia coal mine early Thursday in search of four miners missing since a blast killed 25 colleagues in the worst U.S. mining disaster in more than two decades.
Photos: Vigils for the Miners
Rescue Halted as Mine Air Turns "Explosive"
Mine Worker: "There are no Safe Mines"
Credit: AP Photo/Bob Bird
