Mumbai, Nov 30 (IANS): Security officials went on high alert after a note was found warning of an IS attack on Mumbai Airport's Air Cargo Complex (ACC) on Republic Day (January 26), or "anytime", official sources said here on Wednesday.

The note was discovered in one of the toilets of the sprawling and bustling ACC building, located around 3.5 km away from the Chhatrapati Shivaji Maharaj International Airport on the Sahar Road sometime this afternoon.

Immediately the Central Industrial Security Force, Mumbai police and bomb squads got into action and started evacuating the entire cargo section, and launched a search. It was also decided that people will now be allowed inside only after thorough screening, said officials.

Though the threat note has been received two months in advance, the airport security agencies are not taking any chances.

Top ACC and customs officials were not available for comments in the matter despite repeated attempts by IANS.

In late January 2016, a telephonic threat was received warning that the CSMIA would be blown up within a fortnight, by February 2016.

Though the security agencies concluded it was a "non-specific threat", all teams were on high alert to ward off any untoward incident.