An IndiGo flight bound for Chennai received a threat message on Friday afternoon, prompting officials to return the aircraft to the bay at Delhi airport and move it to an isolation bay for anti-sabotage checks. Flight 6E 6091, scheduled to depart at around 3:15 pm, did not take off after a threat message was reported. According to sources, the Air Traffic Control (ATC) received a call alerting it to the threat. The aircraft had already been pushed back and was preparing for take-off when officials decided to move it to an isolation bay for security checks. Sources said a message reading “Do not fly 6E 6091” was found in one of the aircraft’s toilets. It was not immediately clear whether the message had been written on a piece of paper or directly on the toilet wall. Details about the number of passengers on board were not immediately available. IndiGo had not issued a response to the incident at the time of writing. ‘BOMB’ written on tissue paper found on IndiGo flight in August In a similar incident on August 26, a tissue paper bearing the word “BOMB” was found on an IndiGo flight that had arrived in Bengaluru from Lucknow, triggering a security alert. According to the airline, flight 6E321 departed from Lucknow at 7 am and landed at Bengaluru airport at 9:40 am. After passengers disembarked, cleaning staff began routine cleaning of the aircraft and found a tissue paper with the word “BOMB” written on it in English. An investigation subsequently found no suspicious objects or explosive materials on board.