New Delhi, Oct 26: Chhota Rajan was on the radar since the past month and the CBI was working closely with the agencies in Australia and Indonesia which finally led to his arrest.
The CBI, which is the nodal agency for Interpol related affairs in India, was working closely with both the countries which kept a close watch on Chhota Rajan.
Sources said that Rajan's cover may have been blown by someone close to him. He was in New Castle, but shifted base in July, 2015.
After he realized that his cover was blown, he decided to fly out of Sydney and land in Indonesia. It is still unclear what Rajan's next course of action was after he landed in Indonesia.
He was to check in at a resort, but was arrested on his arrival at the Bali airport.
Home Minister Rajnath Singh said at New Delhi that they were on this case for long now. He, however, added that a verification process will be conducted following which the investigation into the case would follow.
A CBI team would visit Bali and complete the remaining formalities.
India would seek his extradition as he is wanted in several cases in India including the murder of journalist J Dey.
CBI director Anil Sinha said that it was they who had requested that Rajan be arrested.
The CBI has been in touch with the Interpol for several months now. In fact the last known location of Rajan was at Sydney in Australia.
He was being tracked and Australia tipped off regarding Rajan moving to Indonesia, Bali.
The Indonesian police detained Rajan based on a tip off by Australia. He had arrived in Bali from Sydney police spokesman Heri Wiyanto told AFP.
The 55-year-old Nikalje had been on the run for two decades and Interpol had flagged him as a wanted man in 1995, Wiyanto said.
"We received information from police in Canberra yesterday (Sunday) about the red notice for a murderer," he said.
"We arrested the man at the airport yesterday. What we know is that this man was suspected to have carried out 15 to 20 murders in India," he added.
Bali police are coordinating with Interpol and Indian authorities and it is likely Nikalje will be deported to India, Wiyanto said.