Jet Airways has acknowledged the incident.
About 30 of the 166 flyers aboard the Boeing 737 aircraft from Mumbai to Jaipur suffered bleeding in their noses, and some in their ears, and forced the plane to return, according to a statement from the Directorate General of Civil Aviation in New Delhi.
Earlier, the DGCA, in a statement, said that the Aircraft Accident Investigation Bureau (AAIB) has started an investigation into the matter.
"After an hour of high-altitude flying, the flight had to make an emergency landing and about 30 passengers had blood (in ears and nose) and the rest were suffocating, putting the travelers in death-bed situation and condition", said Patel.
Jet Airways said the flight's cockpit crew "has been taken off scheduled duties pending investigation", and it was making alternative arrangements for passengers on board.
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But as the Hindustan Times reported, the country's civil aviation regulator stated that this happened because, "during the climb, crew forgot to select switch to maintain cabin pressure". The plane was heading to Jaipur, a tourist destination and the capital of Rajasthan state.
"I was sitting on an aisle seat when suddenly air pressure in the cabin dropped and oxygen masks came down", passenger Prashant Sharma told India's PTI news agency.
Others posted videos from the cabin, showing passengers sitting quietly and breathing through oxygen masks. "There was no announcement by the crew and nobody knew what to do".
"The revised offering will now allow guests to enjoy more value for money, by letting them choose a travel plan based on their preference, travel requirements and budget", said a Jet airways spokesperson. "All passengers are safe including me", he added.