The trio was arrested near JP Mehta College road here yesterday by Special Task Force (STF).
The have been identified as Ajay Kumar, Rajnikant Singh and Nitesh Kumar, all hailing from Ghazipur district.
A city-based doctor, who runs his clinic in Ordly Bazar, had lodged a complaint with the police after he allegedly received a mobile call on October 28 where the accused "threatened him of dire consequences if their demand for a ransom of Rs 50 lakh was not fulfilled".
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