Crews search for 4 missing in W.Va. coal mine

(AP) - Authorities say rescue crews are working their way through a West Virginia coal mine in search of four miners missing since a blast killed 25 colleagues.

Gov. Joe Manchin say crews entered the Upper Big Branch mine about 30 miles south of Charleston at 4:55 a.m. EDT.

Rescuers had to wait to enter the mine until four ventilation shafts were drilled and dangerous methane gas and carbon monoxide levels dropped to safe levels.

Officials are holding out hope that the miners had somehow survived the explosion by escaping into airtight chambers with enough food, water and air to survive for up to four days.

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