India, June 26 -- NEW DELHI

Four people were killed and three were injured in a massive fire that broke out on Tuesday evening at an illegal four-storey factory building in Rithala, police said, adding that it took nearly 100 firefighters and a 13-hour operation to bring it under control. Police said they have filed a case and are probing the cause of the fire.

The four people who died could not be identified as the bodies were charred, but police said they could be the four persons who were reported missing when the fire broke out. However, they will conduct a forensic test to establish their identities.

"DNA tests will be conducted to confirm the identity of the deceased," a senior police officer said.

A case was registered under se...