India, Aug. 11 -- An explosion at the US Clairton Coke Works facility in Pennsylvania on Monday left several workers injured, a source told WTAE.

Dispatchers said multiple persons have been injured in the blast, adding that they have no idea about the extent of wounds.

As firefighters fight blaze, the helicopter footage on Internet shows a lot of smoke coming from the US plant.

The factory is situated near Clairton, Pennsylvania, about 20 miles south of Pittsburgh, on the banks of the Monongahela River.

According to U.S. Steel, the factory is the biggest coke manufacturing plant in the United States, producing over 4.3 million tons of coke a year while running 10 coke oven batteries.

"Just a report of an explosion! Asking for multipl...