Massive explosion at a chemical factory in Maharashtra kills five.

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A huge explosion in a chemical factory in Maharashtra,Ratnagiri District in India killed four people and injured several others. It is believed that between 40-50 workers are still trapped in the factory.
Two major blasts occurred inside a unit of the chemical factory around 9 am today. The workers injured in the incident were rushed to a government-run hospital, where four of them were declared dead. Another worker, who suffered critical injuries, is being treated.
Police official from Ratnagiri.
The explosion immediately killed the four victims. The injured were taken immediately to the hospital. It is not yet known what caused the explosion, but an investigation has been launched to determine the cause. A rescue operation has been launched to save the trapped workers. More details to follow.
Update: Fire under control and cooling operation is in progress. Preliminary investigation has revealed that the explosion has been caused by an overheated boiler, causing it to explode.