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 operators. Such patterns are seen as potential indicators of diversion for illegal resale across the border. Officials said fuel supply to flagged vehicles would be restricted to normal consumption levels. The second layer involves district administrations in border areas, which have been asked to maintain strict vigilance and coordinate with enforcement agencies. Officials are conducting surprise inspections at fuel stations and tracking bulk purchases. Vehicles frequently travelling into Nepal are also under scrutiny, with their refuelling patterns being monitored across multiple outlets....