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

The preliminary findings say how the company believes the explosion occurred. A union statement cautioned the investigation ...

“Pressure built inside the valve, leading to valve failure and coke oven gas filling the area and ultimately exploding when ...

The deadly explosion at Clairton Coke Works near Pittsburgh occurred when a gas valve was flushed before planned maintenance, ...

The explosion this week at U.S. Steel's Pittsburgh-area plant has reignited debate about its future. The Clairton plant is ...

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 ...