A total of 12 passengers and crew members were reportedly treated at the landing.
A mysterious smell and complaints that the passengers and crew were respiratory problems that forced a Seattle-bound Alaska Airlines flight to divert to Minneapolis-St. Paul International Airport on Wednesday evening.
A total of 12 passengers and crew members were treated at the landing, and four of them were taken to the hospital for further evaluation, NBC News reported.
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Alaska Airlines said the cause of the odor has not yet been identified, but the aircraft is currently being inspected.
“The cause of the smell is being investigated and the aircraft is removed from service, pending an inspection,” a spokesperson told the outlet.
There were a total of 144 passengers on board the flight, which originated in Chicago earlier on the Wednesday evening.
A representative of Alaska Airlines was not immediately available for comment, but did confirm to NBC News that the passengers were offered alternative flights to Seattle.
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Wednesday Alaska Airlines incident follows on the news of an American Airlines flight back to Bradley International Airport in Hartford, Conn., as a result of a mysterious scent, per Fox 61.