LUCKNOW, April 25 -- Amid concerns over fuel diversion along the Indo-Nepal border, authorities have deployed a stringent three-layer monitoring system to curb the smuggling of petrol from Uttar Pradesh into Nepal, where prices are higher.

Officials from public sector oil companies, including Indian Oil Corporation and Bharat Petroleum, said coordinated surveillance is now being carried out at multiple levels to detect and prevent suspicious fuel transactions.

According to authorities, the first layer of checks is at petrol pumps, where unusual refuelling patterns are under close watch. Vehicles making repeated refills within short intervals, particularly those returning within hours, are being flagged by automated systems and pump oper...