An Indigo airlines Dubai-Calicut flight was diverted to Mumbai on Thursday after a passenger's "unruly behaviour", an official said.
A Mumbai Police spokesperson said the passenger was detained for "his unruly behaviour" on the flight but denied that he had raised slogans supposedly hailing the Islamic State.
The passenger was handed over to the airport police around 9.15 am. The flight departed about an hour later minus the offloaded passenger, airport sources said.