U.S. Steel says its preliminary investigation found that the blast happened after pressure built up while a gas valve was ...

Repairing Clairton, however, could be expensive, an investigation into the explosion could turn up more problems, and an ...

The plant, a massive industrial facility along the Monongahela River south of Pittsburgh, is considered the largest coking ...

The Barronvale Covered Bridge stretches its wooden frame across Laurel Hill Creek like a crimson ribbon tied around Pennsylvania’s most picturesque gift. Dating back to 1830, this wooden wonder has ...