Any abnormality on a flight is bound to cause jitters among passengers.
The appearance of heavy steam on a flight in Shenzhen caused widespread panic among travelers, but turned out to be harmless.
According to the photos an Internet user posted on Weibo on Saturday, heavy steam pervaded the whole cabin on the flight, causing low visibility.
It happened before the plane took off.
The Internet user said the steam came from the air conditioner which circulated the vapour into the cabin due to the high humidity outside.
Shenzhen was experiencing heavy rain that day.