A 21-year-old man was arrested by the BSF after he was found roaming under suspicious circumstances near the Indo-Pak border in Ferozepur sector on Friday, the officials said.
He was identified as Mohammad Shahrukh, resident of a village in Moradabad district of Uttar Pradesh.
After checking his mobile phone, BSF sleuths found that he was allegedly connected to various WhatsApp groups which had several Pakistani numbers, the officials said.
The sources in the BSF said the youth was selling bed sheets in Tarn Taran and Ferozepur districts for the last eight months.
The BSF sleuths have seized a PAN card, an Aadhaar card, a mobile, a bundle of bed sheets and some other articles from the man's possession.
After preliminary investigation, he was handed over to officials at the Mamdot police station.
The police said further investigation in the matter was underway.