Vikas Dubey, the main accused in the Kanpur encounter case, was arrested in Ujjain on Thursday. The arrest comes days after an inter-state operation was launched following a raid in which eight policemen were killed when they reached Dubey's house to arrest him.
Vikas Dubey was carrying a bounty of Rs 500,000 on his head.
Meanwhile, Dubey's two aides were killed in separate encounters in Uttar Pradesh on Thursday, police said. While Kartikeya alias Prabhat was gunned down in Kanpur when he tried to flee from police custody, another aide of Vikas Dubey, Praveen alias Bauwa Dubey, was killed in