At least three people have been killed and 20 others injured in a huge blast at a chemical factory in the Greater Mumbai region.

The fire officer of the area has confirmed that the building has completely collapsed, and fire fighters are checking if there are any others still trapped inside.

For the latest, we have on the line our correspondent Shweta Bajaj in Mumbai.

Q1. Hello Shweta, how severe is the blast? And how's the investigation going?