The Union Home Ministry on Thursday directed the CISF to remain on high alert at all the airports and airstrips across the country to check shipment of demonetised high value currency notes of Rs 1,000 and Rs 500 in large volumes.
The alert comes after it was reported that several crores of rupees in demonetised currency notes were transported in a chartered jet from an airstrip in Hisar to Dimapur airport in Nagaland earlier this week.
"All airports have been alerted and directed to keep strict vigil on illegal transportation of cash in high volumes," a senior Ministry official said.
Central Industrial Security Force (CISF), which protects nearly 56 airports and in the country, and Central Reserve Police Force (CRPF) that secures the Srinagar airport in Jammu and Kashmir have been given clear instructions to be on high alert against any such attempt to infuse black money into the banking system.
The CISF had on Wednesday apprehended a Bihar-based businessman, who was travelling alone in a chartered jet from Hissar, following a tip-off from the Intelligence Bureau that he was carrying "suspect money". He was later freed after he produced "tax exemption certificates".
However, during searches conducted by the tax authorities at a few premises owned by a Dimapur-based businessman, the Income Tax Department officials were able to retrieve the missing Rs 3.5 Crore seized from Dimapur airport. The IT officials also impounded another Rs 4.47 crore in demonetised Rs 1000 and Rs 500 currency notes during the searches.