Plane diverted to O'Hare when passengers fall ill

CHICAGO United Airlines flight 167 landed at O'Hare about 8:30 p.m. About a dozen people on board reportedly became sick during the flight.

Ten ambulances were sent to the airport. Fire department spokesperson Richard Rosado said paramedics evaluated about 35 people. Four were taken in fair condition to a hospital.

Sources say everyone affected was from the same tour group. One passenger from that group told a flight attendant prior to taking off that she wasn't feeling well.

Food was reportedly not served on board the flight.

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