The car was heading towards Palghar city from Vadrai village when its driver lost control over the wheels near the Patilwadi turn around 3 am, a police official said.
As a result, the vehicle rammed into the tree on the roadside, he said.
The victims, all locals aged between 25 and 30, could not get any help as the vehicular movement on the road is thin during the early hours, the official said.
The driver of another car, which crossed the accident spot after sometime, alerted the police, he said.
A case was registered at the Satpati police station, he added.
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