The ground handling staff saw the message in the men's washroom of the domestic airport yesterday that warned of an attack by terror outfit Islamic State of Iraq and Syria, the police said today.
"ISIS 26/01/2015 is BOM OK," read the scribble which had the image of an airplane drawn alongside, they said.
Security at the domestic and international airport terminals has been tightened by the Central Industrial Security Force and elaborate security checks are being conducted outside the premises by the Mumbai Police.
On January 6, a similar warning of an attack on January 10 was found scribbled on the wall of a washroom at Terminal 2 of the Mumbai International Airport.
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Areeb Majeed, a young man from Kalyan in neighbouring Thane, has been in the news in recent months for allegedly fighting alongside ISIS militants in Iraq and Syria.
Majeed was arrested by the NIA in November last year upon his return from Iraq and booked under sections of the Unlawful Activities Prevention Act (UAPA) and the Indian Penal Code.