However, they were let-off after hours of intensive interrogation by the military intelligence, state and local intelligence and police, they added.
"Swedish national Andrea Mitchell Olf along with his girlfriend Shreyal Sadana, a resident of Kakadev area ( Kanpur), who works with a multinational company in Gurgaon, had reached Kanpur today.
"Shreyal had accompanied Olf to Saint Mary School where she had studied, and an ancient Church situated adjacent to the school. There some visitors informed the military intelligence sleuths that they were loitering around the area in a suspecting manner," Superintendent of Police (East), Anurag Arya, said.
"They were immediately taken to Cantonment police station where were questioned intensively. But police did not find anything suspicious," Deputy SP (LIU), Vijay Tirpathi told PTI.
They were let-off when the intelligence sleuths found valid documents including passport and visa, which confirmed that the Swedish national had come to India on December 28, on one-month-long tourist visa.