NEWARK, N.J. (AP) -- At least three planes have been searched at Newark Liberty International Airport after anonymous telephone threats were made against international flights arriving at several airports.

A United Airlines jet sits parked at Newark Liberty International Airport
A United Airlines jet sits parked at Newark Liberty International Airport (John Moore/Getty Images)
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Authorities say none of the threats appear credible.

United Airlines spokeswoman Mary Clark says passengers at Newark were removed from a flight after it arrived from Madrid. The plane was being inspected Monday afternoon at a spot away from the terminal.

The FBI in Newark said two other planes also were searched. One was a United flight from Edinburgh, Scotland, and the other was a Delta flight from London.

A series of threats against commercial airliners prompted U.S. military jets to escort an Air France flight into New York's Kennedy Airport after someone claimed a chemical weapon was aboard the aircraft. At least two planes were searched at the airport.
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