Chennai, Nov. 13 -- An anonymous bomb threat in the form of a hand written message found mid air in the Hyderabad-Chennai Indigo airlines flight, triggered security concerns, but after massive security checks, it turned out to be a hoax, providing the much needed relief to the authorities of Chennai airport on Friday.

The message, warning of an explosion at 1.50 pm, was found when the flight, carrying 192 passengers and six crew members, was cruising at an altitude of around 32,000 feet. It was found when a crew spotted a tissue paper bearing the message 'BOOM - 1.50 PM' stuck to a mirror inside the toilet.

The staff member alerted the pilot, who immediately informed Chennai airport's air traffic control room. Following the alert, securit...