At least three people were killed after a Pawan Hans helicopter with at least seven persons, including five ONGC officials and two pilots, on board was lost at sea shortly after taking off from Juhu Airport on Saturday morning.
It was reportedly 30 nautical miles off the western coast before going off-radar.
Search operations are on, they added. Large scale Indian Coast Guard sear and rescue operation underway.
According to media reports, the chopper was last in touch with the air traffic control around 10.30 am.
The helicopter had been leased to ONGC by the state-owned Pawan Hans helicopter firm.
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As per reports, the helicopter was airborne at 10.20am, and it lost contact with air traffic control 15 minutes later.
The chopper was supposed to land at offshore oil rig Bombay High at 11 am, the Press Trust of India reported citing unnamed sources.
On not knowing the whereabouts of the passengers or the pilot, ONGC alerted the Indian Coast Guard about the same.
In the latest update, Defence Minister Nirmala Sitharaman tweeted saying all posible assistance is being extended in the rescue operations.