The accident took place in Raigad district's Uran village.
"The incident occurred at 10.15am when the Chetak helicopter was landing after a routine training sortie in the area. Due to some technical snag it had a rough landing and crashed due to the impact," an official source told IANS.
Four people on board managed to quickly jump off the chopper safely.
They sustained injuries and have been taken to INHS Ashvini, the naval hospital in south Mumbai.
The Indian Navy will probe the incident, the official said.
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