The crew of an Indian airline tied an Italian woman to her seat during a flight after she allegedly punched one member of staff and spat on another.
The woman, who was traveling on a Vistara flight from Abu Dhabi, was arrested in Mumbai on Monday and later released on police bail.
Her lawyer has denied the allegations, saying it is a "false story".
But Vistara said its staff had to restrain the woman for "continued unruly conduct and violent behaviour".
The Times of India newspaper reported that a Vistara staff member alleged in a police complaint that the passenger punched them and spat on their colleague.
According to the complaint, the crew member had objected after the woman left her economy class seat to sit in business class.
The complaint also accuses the woman of "stripping and littering the plane".
Vistara said in a statement that the flight's captain "issued a warning card and made a decision to restrain the customer" because of her behaviour.
Scrutiny of misconduct by air passengers has increased in India after a man was arrested in January for allegedly urinating on a female passenger - the incident sparked criticism of how the airline, Air India, had handled the incident.
Since then, several cases of alleged unruly behaviour have been reported on board other Indian flights.
