At least eight persons were killed and several others injured when a massive blast followed by a fire ripped a chemical factory at Boisar in Palghar district, nearly 100 km north of Mumbai, on Saturday, officials said.

Top Palghar district administration, police and fire brigade officials have rushed to the spot for the rescue operation, while Fire Brigade teams from Boisar MIDC industrial area and Tarapur Atomic Power Station are engaged in dousing the flames.

As per local witnesses, the intensity of the explosion was so severe that it was audible in a 35-km range and one building in the factory collapsed.

Besides, many homes in the immediate vicinity were shaken and people ran outside thinking it was an earthquake, as power lines also failed.

The exact cause of the explosion-cum-blaze which occurred around 7 p.m. is not immediately available