Two people were killed and two others injured after an explosion in a pharma company followed by a massive fire in the West Indian state of Gujarat in the Valsad district Monday night.

Indian news source NDTV shared that, as per officials, a sudden explosion happened in Van Petrochem Pharma Company in Sarigam GIDC Chemical Zone of the Valsad district. Part of the building caved in during the incident.

The injured were immediately rushed to a nearby hospital.

Firemem also were on site but could not use water on the fire, as they were unaware of the chemical that engineered the blast before the blaze.

"We received a call that a fire had broke out. 'Til now, two bodies have been found. Two people are admitted to the hospital. When I reached here with the firefighters there was no security personnel. We cannot start the fire fighting operation as we are not sure, which chemical is there, which has caused the fire," Rahul Murari, firefighter Sarigam said.

Rescue operations have been stopped temporarily and were to resume this morning.

The reason behind the blast and the condition of workers inside the factory is yet to be determined.