A tiring analysis of tons of such data, which Delhi Police termed "aerial surveillance and technical penetration" finally put them on the trail of 27-year-old gangster.
The Special Cell of Delhi Police which was hunting for him for the last 18 months had learnt that the gangster was observing "complete radio silence" and was exploiting hitherto unheard loopholes in internet-based communications to conceal his real location.
"For example, if he was in Kolkatta, his location would come in Agra. His victims, associates, arrestees and sympathisers revealed Neeraj was, to almost all of them, an 'enigma', a 'ghostly figure'," a senior police official said.
He never used a phone for mobile data to avoid being tracked and maintained complete radio silence.
Almost for six months, police kept analysing this data and the broad contours of the track being left behind by this gangster started becoming clearer to the Special Cell.
Delhi, Meerut, Ranchi, Kolkata, Agra, Ahmadabad, Vadodara, Silvassa, Diu, Udaipur, Chandigarh, Rohtak etc were the places where the don travelled.