Authorities said a bomb threat at Milwaukee's Mitchell International Airport Thursday was a hoax.

Patricia Rowe, airport spokeswoman, said someone e-mailed the threat. Rowe would not describe the nature of it, or who received it at the airport.

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The FBI joined the Transportation Security Administration and Milwaukee County sheriff's deputies in investigating the incident, and they found it had no credibility.

Rowe said no flights were delayed or canceled because of it.