On flight 6E451 from Bengaluru to Lucknow, a passenger spotted the handwritten threat note in the aircraft's toilet and alerted the crew. IndiGo flight 6E-451 returns to Bengaluru after a hijack-threat note found onboard; security checks reveal it as a hoax. An IndiGo flight carrying 178 passengers was forced to return to Bengaluru after a handwritten note warned of a hijack at 6:30 pm. Security teams searched the aircraft, while police.