The Army authorities had detained three suspects, Ravinder Kumar, Dharamvir Singh and Nikam Kumar Pandey, in Nagpur, Thane city police Commissioner Param Bir Singh told reporters at a press conference here this evening.
Thane police would soon take their custody, he added.
The police have so far arrested 21 people in connection with the leak of the Army recruitment exam paper which came to light on February 26.
Santosh Shinde, owner of Raje Chhatrapati Academy at Phaltan in Satara district of western Maharashtra who has been arrested, was believed to be the kingpin of the racket, Singh said.
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After the Thane police busted the racket on February 26, the Army cancelled the examinations at a number of centres including Kamptee, Nagpur, Ahmednagar, Ahmedabad, Goa and Kirkee, which come under the Pune zone.
Thane police had last week received information from an institute, which conducts coaching classes for Army job aspirants, that some city students were to be given the question papers in advance for a price.
The Army has instituted a high-level Court of Inquiry to probe the matter.