Thiruvananthapuram

Speaking to IANS, the official, on condition of anonymity, said the threat came in a letter two days ago.

"The death threat that came in a letter, mentions the name of the Jaish-e- Mohammed terror group. It has now been sent for a high-profile forensic examination and the test results are awaited. The police have already registered a case and detailed investigations are going on by multiple probe teams of the Kerala Police," he said.

The 75-year-old Nair, who resides in the heart of the state capital, retired as chairman of the Indian Space Research Organisation in 2009 and is a Padma Bhushan and Padma Vibhushan awardee.

He played a crucial role in the design and development of the cryogenic engine for the Geosynchronous Satellite Launch Vehicle (GSLV).

Last year, Nair joined the Bharatiya Janata Party.

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