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Firefighters try to extinguish fire in the National Museum of Natural History in New Delhi, India on April 26, 2016. Image Credit: AP

New Delhi: A massive fire gutted a natural history museum in the Indian capital on Tuesday, destroying rare specimens of flora and fauna, the Indian environment minister said.

The blaze broke out overnight on the sixth floor of the building that houses the museum in central Delhi and rapidly engulfed the other floors, a fire official said.

Thirty-five fire fighters battled for hours to extinguish the blaze. Five of them were injured while trying to contain the blaze and have been taken to the hospital, a fire department official said.

Environment minister Prakash Javadekar said officials had yet to determine the full extent of the damage but old collections had been destroyed.

"This is a real loss. This loss cannot be counted in rupees. Some very old species of flora and fauna were there," Javadekar told reporters outside the museum, adding some were rare.

He also ordered an immediate safety audit of the country's 34 major museums.

The museum, inaugurated in 1978, contained preserved specimens of butterflies, frogs, snakes, lizards as well as mounted specimens of tigers and leopards.

Fire accidents are common in hot summer months across India, with short circuits in dilapidated buildings often triggering blazes.