A Pawan Hans helicopter with seven persons on-board, including five ONGC officers and two pilots, crashed off the Mumbai coast minutes after it took off for the state-owned company's oil installation in the Arabian sea.
So far, four bodies have been recovered, Oil and Natural Gas Corporation said in a statement to PTI.
Search operation is on for other missing persons.
ONGC has key oil and gas fields off the Mumbai coast and Pawan Hans helicopters routinely ferry company employees and officers to the oil installations that are situated as far as 160 kilometres from the coastline.
"Identification of the bodies is in progress".
The chopper Dauphin N3 had gone missing after taking off from Juhu aerodrome at 10.30 AM.
The chopper, bearing registration number VT-PWA, was scheduled to land at the designated oil rig at Mumbai High at 11 am. Five employees of state-owned Oil and Natural Gas Corporation (ONGC) and two pilots were on-board the chopper.
The Navy said it had deployed its stealth frigate INS Teg for the search operation, while surveillance aircraft P8i was also pressed into service.
The Coast Guard had also diverted its ships to search the missing chopper.
He said the DGCA will extend all necessary help to the AAIB in conducting the probe.
"IndiaCoastGuard Ship on receipt of information reached area, located the debris, picked up a body at 1230 hrs," he said on twitter.
"So far resulted in 03 body recovery. Search & rescue operations are underway. Aircraft Accident Investigation Bureau will launch thorough inquiry (sic)," he tweeted.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)