An Air India flight from Phuket to Delhi plunged nearly 300 feet in a sudden bout of severe turbulence on Tuesday, injuring at least 11 passengers and four crew members, officials said.

Flight AI 2379, an Airbus A320 carrying more than 100 passengers, took off from Phuket around 8:25 am local time and landed safely in Delhi around 11 am, according to airline and regulatory officials. A senior Directorate General of Civil Aviation official told PTI that the pilot in command reported a severe injury to one cabin crew member, an injury to another, and minor injuries to a few passengers after the aircraft suddenly lost about 300 feet of altitude.

Passengers described a chaotic scene inside the cabin. One traveler said the aircraft rolled sharply without warning, throwing some people into the ceiling before they fell back to the floor, while loose luggage struck passengers in the head. A baby around one to one-and-a-half years old was thrown roughly three seats away, according to the same account.

An Italian passenger named Viviana, who was traveling with her family, said she watched her sister get thrown into the air from her seat and her mother hit her head during the turbulence. She said the passengers thought they would die, adding that a male passenger nearby had blood on his face.

Another passenger who was sleeping when the turbulence began said the aircraft appeared to stop suddenly before entering a turn that lasted two to three minutes, injuring an estimated 15 to 20 people onboard, including the baby. He said passengers intend to pursue action against Air India over the incident.

Some of the injured were taken to Medanta Hospital in Gurugram and the Indian Spinal Injury Centre in Vasant Kunj for treatment. The cause of the sudden turbulence remains under review.

A separate passenger recalled that the aircraft suddenly dropped altitude, causing several fliers to strike their heads against the overhead bins. Investigators have not yet said what triggered the sudden loss of altitude, and the airline has not issued a detailed public statement beyond confirming the injuries to regulators.