Bablu had allegedly fired at his rival Kalu when the later was taking a child of his (Kalu's) family to the school, located in the area, on February 15.
Kalu was injured when the bullet grazed his leg, but the bike-borne accused sped away.
An ARS official said, two other persons were also detained in connection with the incident which is the fallout of a long-standing feud between Bablu and Kalu.