Dozens of passengers suffered ear pain and nose bleeds due to the loss of cabin pressure on a flight in India.
The Jet Airways flight was forced to return to Mumbai after departing for Jaipur, a tourist destination and the capital of Rajasthan state.
Of the 166 passengers on board, 30 required medical assistance, the airline said.
The Press Trust of India news agency quoted an official as saying the malfunctioning occurred during the plane’s ascent.
The airline said the flight’s cockpit crew has been taken off scheduled duties pending an investigation.
Darshak Hathi was one of the passengers on-board the Jet Airways flight.
He described the plane's technical fault as a "panic situation" and shared a video of passengers wearing the face masks.
Melissa Tixeira was on the flight and she said there was no information given to the passengers.
Tixeira had filmed herself and fellow passengers who were left stranded following Jet Airways' emergency landing.
Jet Airways said in a statement which was released on social media: "The B737 aircraft, with 166 guests and five crew landed normally in Mumbai.
"All guests were deplaned safely and taken to the terminal.
"First aid was administered to a few guests who complained of ear pain, nose bleeding etc."
The airline added: "Jet Airways regrets the inconvenience caused to its guests."