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The woman was detained by police and turned over to the FBI, police said.
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The flight was United 1982 from New Orleans.
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The FBI has responded to the incident and will release more information later, a spokesperson said.
In an unrelated incident, police arrested an IAH employee for bringing a gun into the secure area. Police arrested Dvarius Conerly, 22, on a charge of possession of a prohibited weapon.
The incident happened Saturday, according to court documents.