India, Aug. 13 -- A day after the arrest of a suspected Pakistani national and his "associate" by the West Bengal STF, investigators were examining how they obtained a map and photographs of Fort William, the Indian Army's Eastern Command headquarters here, a senior official said on Thursday, Aug 13.

Rana Rauf Khalid alias Wahab Alam and his alleged associate Mohammad Ijaz were arrested by the West Bengal Special Task Force from Habra in North 24 Parganas district late on Tuesday, while they were "trying to reach the Bangladesh border" through Jessore Road.

The recovery of the Fort William material has emerged as a key line of investigation, with the STF trying to establish its source and intended use, the official said. "One of the imp...