The explosion was so intense that large blocks of concrete were strewn up to 50 metres from the site and it was difficult to identify and count the bodies. The toll was "roughly estimated" at 19 from the missing list given by relatives of workers, Revenue and police officials said.
The muster roll of the company was being verified to ascertain how many workers were present at the time of explosion and to confirm the total number of deaths.
Eight of the injured workers admitted in the hospital were in a serious condition and they were being treated at the intensive care unit of the government hospital.
District Collector Palanisamy said an investigation would be conducted by the Controller of Explosives and officials from the Labour Welfare Department.
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Initial investigation revealed that the blast could have occurred while packing the explosives.
"Either the workers would have applied more pressure (while packing) or mixed the chemicals in wrong proportion," a Senior official of the Explosives Department said.
Though local people wanted the factory to be closed permanently, the Collector said he had not received any request with this effect.
Explosives experts were camping in the factory to defuse unexploded gelatin sticks, if any, in the factory.