An eyewitness said that the series of explosions were so powerful that nearby houses shook, glass was broken and frightened locals came out into the streets.

Within minutes, a massive fire broke out in the factory and thick clouds of smoke were seen billowing into the air, while half a dozen fire tenders, water tankers and rescue teams rushed to the spot.

There were unconfirmed reports of at least five people being injured in the explosion-cum-fire at the factory, a local said.

More details were awaited.