27 passengers were injured after a flight hit 'unexpected turbulence', Russian airline Aeroflot has said.
The incident happened on board a Boeing 777 that was flying from Moscow to Bangkok.
According to Aeroflot, the plane hit a zone of 'sudden strong short-term turbulence' around 40 minutes before it was due to land in Bangkok.
In a video post on Instagram, one passenger suggested the turbulence "was so bad that it was throwing people around like crazy".
He added: "Blood everywhere, people with broken bones, noses, open fractures, [babies] with head injuries."
His video showed injured passengers on the ground and items strewn around the cabin.
The airline quotes Thai doctors as saying none of the 27 injured passengers received serious or life-threatening injuries.
15 Russian citizens and two Thai citizens remain hospitalised with bruising, while some have fractured or broken bones. The airline also claims that none of the passengers suffered spinal compression fractures.
The other passengers were discharged after undergoing medical examinations.
In a statement, the airline said: "An experienced crew piloted the flight. The pilot has more than 23,000 flight hours, and the co-pilot has over 10,500 flight hours. However, the turbulence that hit the Boeing 777 was impossible to foresee.
"The incident was caused by what is known in aviation as 'clear-air turbulence'. Such turbulence occurs without any clouds, in clear skies with good visibility, and weather radar is unable to alert of its approach."
Aeroflot suggests crew in such situations cannot warn passengers to return to their seats, and notes there are hundreds of clean-air turbulence cases recorded every year.
The airline says they will cover all passengers' medical and re-ticketing expenses following the incident.
