One person has died, 10 have been injured and one person is unaccounted for after an explosion at a steel works left multiple people trapped under rubble.

The explosion happened at the Clairton Coke Works plant near Pittsburgh, Pennsylvania, which was engulfed in heavy smoke as the major rescue operation got underway.

The plant, a massive industrial facility along the Monongahela River south of Pittsburgh, is considered the largest coking operation in North America and is one of four major US Steel plants in Pennsylvania that employ several thousand workers.

21:15 Zahra Khaliq

Investigation launched into explosion

Local authorities are working alongside US Steel to get to the bottom of what triggered the Clairton Works explosion.

"With their full cooperation and transparency, we ai

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