Investigators confronted them with inputs they have acquired from the Indian Computer Emergency Response Team (CERT-In), the Indian government's nodal agency that deals with cyber security threats, which Delhi Police had approached for help in the case, a senior official said, adding so far they have found no incriminating evidence against them.
Meanwhile, sleuths interrogating the three arrested in connection with the terror ring, claimed to have traced the communication trail in Pakistan.
Delhi Police has also sent a proposal for the procurement of hardware for its new social network monitoring centre aimed at tracking down youths who are at the threshold of radicalization and provide them with the right counselling.
Delhi Police's anti-terrorism unit Special Cell had picked up 13 youths from Delhi and Uttar Pradesh after a series of late night raids on May 3, following which three -- Sajid, Sameer Ahmed, and Shakir Ansari -- were arrested and the remaining 10 detained for questioning.
