All passengers were evacuated from the emergency exit after an Indigo flight, which was scheduled to fly from Delhi to Varanasi, received a "specific bomb threat" on Tuesday.

The flight was sent to the isolation bay for inspection.

In a statement, the airline was quoted as saying by India Today, "IndiGo flight 6E2211 operating from Delhi to Varanasi had received a specific bomb threat at Delhi airport. All necessary protocols were followed, and the aircraft was taken to a remote bay as per guidelines by airport security agencies."

"All passengers were safely evacuated via the emergency exits. The flight is currently undergoing inspection. Post completion of all security checks, the aircraft will be positioned back in the terminal area," the private airline confirmed.

The flight was scheduled to take off from 5.35 am.

"At 05:40 am, a phone call was received from the IGI airport regarding a bomb threat. A message 'BOMB BLAST @30 MINUTES' was written on a piece of paper inside the lavatory of the flight and was found by the pilot," an official told NDTV.