BLOOMINGTON, Minn. (AP) — An Alaska Airlines flight was diverted to Minneapolis-St. Paul International Airport after a foul odor sickened some passengers and crew members.

The flight from Chicago to Seattle made the unscheduled landing about 7 p.m. Wednesday. The flight was canceled and passengers were rebooked on other flights to Seattle.

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Airport spokesman Patrick Hogan says the smell was much like burnt plastic, but the source of it has not been identified. He says some people were having trouble breathing.

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Eight people, including six crew members, were medically evaluated at the airport and four were taken to a hospital.

Flight 51 was carrying 144 passengers.

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