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They said a private security guard found the note in a toilet in the cargo section around 6 pm and it read "attack the cargo on 26.01.18 or anytime - ISIS".
The cargo terminal area has been evacuated and the Bomb Detection and Disposal Squad (BDDS) is at the spot, an airport spokesperson said.
The note looks like a hoax, sources said, adding anti- sabotage checks were being conducted in the cargo area.
"While the cargo area is not secured by the CISF, passenger checks and vigil has been enhanced in the main airport terminal area," a senior CISF officer said.