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PHILADELPHIA (CBS) — Multiple passengers fell ill on separate international flights coming into Philadelphia International Airport on Thursday.

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Officials say 12 passengers arriving at the airport on American Airlines flights from Paris and Munich experienced flu-like symptoms. Multiple ambulances were dispatched to the airport.

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All 250 passengers and crew on the flights were held for a medical review and the Centers for Disease Control and Prevention was notified to investigate.

The CDC, Philadelphia Health Department and the Philadelphia Fire Department personnel performed medical evaluations on the passengers.

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“CDC is aware of two American Airlines flights from Paris and Germany that arrived at PHL airport this afternoon with ill passengers on board. CDC and Philadelphia public health officers worked with EMS and CBP officials to evaluate and test the ill passengers for influenza and other respiratory illnesses. Twelve passengers from the two flights reported sore throat and cough; none were identified with fever. None of the passengers are severely ill, and they will be released and informed of test results in 24 hours,” the CDC said in a statement.

The 12 passengers who felt sick and were tested for the flu were released.

It’s not yet known what caused the people to become sick.

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No one was hospitalized.