Flames and heavy smoke billow out of the plant owned by US Steel as firefighters struggle to extinguish the fire.

Multiple explosions at a US Steel plant near Pittsburgh, Pennsylvania have killed two people and injured 10, according to the company and local authorities.

The blasts at the Clairton Coke Works – part of a sprawling industrial complex along the Monongahela River – took place just before 11am Eastern Time (15:00 GMT) on Monday.

Firefighters battled flames and heavy smoke that billowed out of the plant, which is owned by US Steel, a subsidiary of Nippon Steel.

Initially, two people were reported missing. One person was found and transported to a local hospital, said Allegheny County Police Assistant Superintendent Victor Joseph at an afternoon briefing.