A terse note addressed to India's rihest man, Mukesh Ambani and his wife Nita, which was found in an abandoned vehicle on Carmichael Road close to their residence on Thursday, carried an explicit threat.
It said the gelatin explosives left behind in the vehicle along with the note had not been assembled, but next time they would be, reports the Times of India.
Mumbai Police sources said the message which had been transliterated from Hindi to English, was marked by spelling errors and a coarse style which suggested that the writer was either semi-literate or pretending to be so.
Mumbai police spokesperson, deputy police commissioner Chaitanya S, said the "suspicious vehicle" was found under the jurisdiction of Gamdevi Police Station.
"Police were alerted. The Bomb Detection and Disposal Squad team and other police teams reached the spot immediately, examined the vehicle, and found some explosive gelatin inside. It is not an assembled explosive device. Further investigation is on," he said.
Police said that they have towed away the vehicle for investigation.
"A few more number plates were also found from the vehicle and we are verifying it," said an officer.
Police said from the CCTV footage it appeared the vehicle was parked at the spot early Thursday. Proprietor of a grocery named Vijay Stores, Rajesh Singh, outside whose shop the SUV was parked, told TOI that his CCTV showed the vehicle arriving around 1 am on Thursday.
"The driver did not come out of the vehicle till around 3am,'' he said. Police are scanning his shop's CCTV footage to trace the person who parked the vehicle and left. "It appears to be a hoax, and somebody has played a serious prank. We will trace and arrest them soon," said an official.
The shopkeeper, Rajesh Singh, told TOI that when the police broke open the car, they found several number plates inside.
Till late evening, several police vans, commandos and dog squads were stationed outside Ambani's residence. Investigators are also checking CCTV cameras at various locations to trace the person who parked the car. Dozens of personnel from the Gamdevi police station were deployed on Carmichael Road all day