Half a dozen personnel from crime and forensic branches accompanied by fire services personnel visited the building this afternoon. The forensic personnel picked up samples while the staff of the building was questioned by other members, a senior police officer said.
The building was taken over by police after firefighters completed cooling of the charred edifice in a marathon operation, the officer said.
A case under section 436 of IPC (mischief caused by fire or explosive substance with intent to destroy house) has been registered against unnamed persons in connection with the incident.
The nearly four decade-old NMNH, housing thousands of rare specimens of flora and fauna including a 160-million-year old fossil bone of the Indian Sauropod Dinosaur, was ravaged in a massive blaze yesterday.
The officials are also trying to list the items destroyed and assess the loss.
