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ST. LOUIS (AP) — A threat that caused an American Airlines flight to be diverted to St. Louis has been deemed not credible by law enforcement, though the incident prompted an FBI investigation and use of bomb-sniffing dogs.

Flight 534 left Columbus, Ohio, and was heading for Phoenix when it landed at Lambert Airport at 8:14 a.m. Thursday. The FBI says the pilot decided to divert the plane, but spokeswoman Rebecca Wu declined to say what specifically led to that decision.