The police personnel from Pandav Nagar were on patrol duty on July 13 night when they spotted four persons, with faces covered, coming out with a box from an ATM kiosk, said DCP(East) Omvir Singh.
A police team led by Special Staff inspector Videsh Singhal and SHO of Pandav Nagar Navin Chandra was formed to arrest the accused who escaped after firing at the policemen, he said.
During investigations, the team members employed electronic surveillance and scrutinised facebook accounts of some suspects.
Finally, on a tip-off about one of the gang's member, Prashant Kumar (25) was arrested yesterday, he said.
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He was driving a stolen car, which was also used by the gang during in the incident in Pandav Nagar, the DCP said.
During interrogation, he told police that he had come in contact with Salim and his associates, who ran a gang, while being in jail in 2016 and joined them after his release, the officer claimed.
Police also recovered 16 stolen mobile phones and stolen garments and other articles from him.