Several people including firefighters are trapped under the debris of a factory in west Delhi's Peera Garhi after it caught fire and the structure collapsed following an explosion, officials said.

Thirty-five fire engines are at the site. The firefighters were working to rescue people stuck in the burning building when the explosion happened and brought down the structure.

A call has been received by the fire department for help at 4:30 am, officials said, adding they initially sent seven fire engines to the factory.

Rescueoperations are on.