Two fire engines were pressed into operation which brought the blaze under control after over an hour, district fire officer C M Routray said.
There was no casualty in the fire.
He said a spark triggered by a short circuit in one of the uninterrupted power supply (UPS) in the radio station caused the inferno.
"Equipment including UPS, invertors, some furniture and a part of the ceiling have been gutted in the mishap," Routray said adding there was no fire-fighting equipment in place in the radio station.
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"Among the deceased are three women. The deceased have
been identified as Sarika Dasari (45), Nirmala Chabukswar (35), Anuradha Nimbole (17) and one Manoj," police said.
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In another incident, an oil company was gutted in a
blaze that broke out in Angaon near Bhiwandi in Thane district.
However, no casualty was reported in the mishap as the workers were not present there because of Sunday.
The cause of fire is being probed.
A spokesman of a cow shelter located adjacent to the factory said around 1000 cows in the facility are safe.
At least four fire engines are still trying to put out the flames.