The boy went missing from his home in Sector 17 and after a futile search by his parents, they lodged a complaint with the Vashi Police.
The only child of his parents, Naman was found missing from his room around 1.00 a.m. by his father, Bhaskar Dutt who is a BARC scientist.
Later, police said he was seen on the building's CCTV grabs sporting jeans and a T-shirt, carrying a rucksack, and leaving the premises around 10.30 p.m., more than two hours before his father noticed his absence.
Barely 20 minutes later, he was seen catching a sub-urban train to CSMT around 10.50 p.m., but he remained incommunicado as his mobile phone was switched off since.
Dutt, a brilliant student, was studying in Class 12 at PACE Junior Science College, Nerul, and simultaneously preparing for his IIT-JEE, said Deshmukh.
His mother, Chandra Dutt, a consultant psychologist, had said earlier that her son was shy and introvert and had been treated for depression after a relative died in an accident in Dubai and her husband survived a potentially life-threatening road crash.
(with additional input from agencies)