wendy gillette has our report. >> reporter: emergency workers wheeled some of the 30 people injured on stretchers through denver international airport. they were all on board this united airlines jet en route from washington to los angeles that briefly hit severe turbulence tuesday night. >> all of a sudden, plane dropped probably, you know, 20, 30 feet. i saw at least two people hit the ceiling. the girl in front of me two rows, saw her hit the ceiling and slam back down. >> reporter: the plane carrying 255 passengers and 10 crew members was diverted to denver after the incident. emergency vehicles rushed to the airport to meet the jetliner when it landed. 2 1 people were taken to five local hospitals. some of them shielded by sheets from the media. most of the injuries were not serious, but one person was critically hurt when the turbulence disrupted an otherwise normal flight. >> couple oxygen masks popped down, drinks went flying. it was all over in about two, three second. so, we were weightless for probably a second or two. >> reporter: the federal aviation administration says th