A passenger on an IndiGo flight from Mumbai to Kolkata was caught on video slapping a fellow traveler who was having a panic attack.
The incident happened Friday after boarding was complete but before takeoff.
The man having the panic attack was reportedly crying and asking to get off the plane when another passenger in a white shirt walked by and slapped him across the face.
Flight attendants were trying to help the panicking passenger when the assault occurred.
After the plane landed in Kolkata, the passenger who did the slapping was removed from the flight and declared "unruly" by airline officials.