The arrested man has been identified as Javed Kamal (38), a native of Faisalabad in Pakistan, Deputy Commandant (SSB) Manish Kumar said today.
SSB has recovered a Pakistani passport and documents in Javed's name from his bag.
"Javed claims to be an agricultural scientist and was coming to India for research. He claims to have reached Nepal via Bangkok by flight," he said.
According to Javed, he had reached the border by bus from Kathmandu yesterday morning.
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The passport carries stamps of Bangkok and Kathmandu, he said,
SSB said that the Pakistan Embassy in Delhi has been intimated about the arrest.
"Javed has also claimed that he was unhappy in Pakistan and wanted to settle in India. He said he also wanted to trace his forefathers in India because his family had shifted to Pakistan after partition," Kumar added.