The 26-year-old was caught from a hotel on Thursday by CID on a tip off with classified information about defence installations.
"He was produced before a local court where the magistrate remanded him to police custody till August 24," a senior official said.
"He is being jointly interrogated by intelligence agencies here," he said.
The Pakistani national arrived India on visa on August 5. His visa was for Jodhpur but he went to Jaisalmer in violation of the visa norms and stayed at a hotel.
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