Officials in Colorado have declared a local state of emergency for the mountain town of Leadville after concluding that some 1 billion gallons of contaminated water could explode from an unused mine tunnel. Water pressure inside the mine has been rising for two years, and the chances for a catastrophic explosion increase as time goes by. The U.S. Environmental Protection Agency said it is "concerned that an uncontrolled, potentially-catastrophic release of water to the Arkansas River from [the tunnel] is likely at some point."

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