Six firemen have been injured in the fire, two are in a critical condition.

The fire broke out at around 1.45 am on the sixth floor of the museum located in the FICCI complex near Mandi House in central Delhi, and quickly spread to all seven floors. A part of it also spread to another building in the complex - the FICCI Auditorium - which has not been damaged much.

Firemen with as many as 35 fire engines were at work through the night to put out the blaze, which was brought under control only around 5 am.

A senior fire officer told NDTV that the building's fire safety mechanisms were not working. "That is why it took us so long to douse the fire. The cooling off process is still on," he said.

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