A Canada bound airliner was forced to make an emergency landing after severe turbulence injured 21 passengers, including three children, officials said. The Air Canada flight from Shanghai to Toronto was diverted to Calgary after the turbulence hit. Eight passengers suffered neck and back injuries and 13 more were taken to hospital for observation. Those hurt were in a stable condition, an emergency services spokesman said. Passengers described the experience. “To start with it was just OK, normal, just up and down, and all of a sudden it was really violent and just shaking everybody,” said Yi Lee. “Suddenly the flight is just going down and everything is just scary. The girl sitting next to me, she was sleeping and she just flew up (to the ceiling),” said Linda He.” The Boeing 777 had 332 passengers and 19 crew members on board.