"Arif had used many SKPYE accounts to communicate and we want the details of the accounts to know about the persons he spoke with," said an NIA official.
Sources said that once the details of the accounts are shared then it will help the NIA to find out those persons with whom he was in touch.
"The accounts will help us know about the persons with whom he was in touch before leaving for Iraq and during his stay there," an official said adding that the agency will write to SKYPE Communications, Luxembourg in due course of time", an official said.
The 23-year-old youth from neighbouring Kalyan landed in Mumbai on November 28 following which he was immediately detained by security agencies, and was later arrested.
A case under sections of Unlawful Assembly Prevention Act (UAPA) and section 125 of IPC which deals with waging war against any Asiatic country which has friendly ties with India, was registered against ISIS, Arif and three other youngsters.
According to police, four engineering students flew to Baghdad on May 23 as part of a group of 22 pilgrims to visit religious shrines in Iraq.
On August 26, Shaheen Tanki called up Arif's family and told them that their son had become a 'martyr' claiming that the latter died fighting for ISIS in Syria.
Accordingly the next day, Arif's family performed 'Janaza-e-gayabana' (prayers for the departed soul in absence of the body) in Kalyan.
