An explosion at a US Steel plant near Pittsburgh, Pennsylvania, left two people dead and at least 10 injured on Monday, heavily damaging the sprawling facility, officials said. One worker was pulled from the wreckage hours after the explosion sent black smoke spiralling into the midday sky in the Mon Valley,

Preparations for a routine maintenance task may have led to an explosion at a U.S. Steel coal-processing plant near Pittsburgh that left two dead and sent 10 to hospitals, the company said Friday.