The incident happened at around 10 a.m. at the Los Angeles International Airport.
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In a statement sent to our sister station, ABC7 Eyewitness News Los Angeles, Delta said the passenger opened one of the plane's emergency exit doors and slid down the emergency slide as the plane was preparing to taxi.
The passenger was detained by Los Angeles Airport Police and was taken to a local hospital for a mental evaluation.
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The Seattle-bound plane eventually returned to its gate and all other passengers were rebooked onto a different flight.