"During the course of interrogating the three, we have come to find that their escape route was to the north and ultimately to Leh in Ladakh believing that the West Bengal police will not be able to track them in the hilly terrain," Deputy Commissioner of Bidhannagar City Police Arnab Ghosh told reporters here.
They had also planned for a brief stay there, he said.
Ghosh said that they, however, would not have been able to cross the border as the police had already issued look out notices across the country.
He said that the police were examining the profiles of those using the Saradha software for entering the group's IT system and the modus operandi of their functioning.
Sen along with Debjani Mukherjee and Arvind Chauhan were arrested by J&K police on April 23 from Sonamarg.