AUSTIN, Texas, April 5 (Reuters) - A United Airlines flight attendant deployed an emergency evacuation slide on an airplane after it arrived in Houston and used it to exit a plane packed with passengers, an airline official said on Tuesday.

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"It is our understanding that she deployed it intentionally," said United Airlines spokesman Charlie Hobart, adding airline officials have been speaking with the flight attendant to see why she deployed the slide in the incident that took place on Monday.

In a video shown on Houston TV station KPRC, the flight attendant tosses her bag out of a door behind the cockpit and slides down the slide. She grabs the bag and walks away from the plane, which was at full stop.

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A photo of the airplane on the station's website shows it at the gate, with the slide deployed on the side opposite of the gate.

The flight, with 159 passengers and six crew members aboard, was from Sacramento to Houston's George Bush Intercontinental Airport. The airplane, a Boeing 737-900, was briefly taken out of service for maintenance and then was returned to its scheduled use.

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The flight attendant, who was not identified by the airline, has been removed from flying duties. All the others aboard exited the plane without incident or injury.

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BOS - Boston Logan The lines moved fast at TSA security checkpoints at Logan Airport's Terminal A. (Photo by John Tlumacki/The Boston Globe via Getty Images) 22. CLT - Charlotte Douglas International A US Airways plane prepares for take-off at Charlotte-Douglas International Airport on January 16, 2009 in Charlotte, North Carolina. US Airways flight 1549 crashed into the Hudson River in New York City on January 15, 2009 shortly after take-off from LaGuardia Airport on its way to Charlotte, North Carolina. (Photo by Streeter Lecka/Getty Images) 21. DEN - Denver International Security lines at Denver International Airport are long but moving fast, November 26, 2014. The airport was busy with thanksgiving travelers. (Photo by RJ Sangosti/The Denver Post via Getty Images) 20. SFO - San Francisco International Passengers walk to the JetBlue Airways departure gate October 17, 2014 at the San Francisco International Airport in San Francisco, California. 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AFP PHOTO/Paul BUCK (Photo credit should read PAUL BUCK/AFP/Getty Images) 7. YYZ - Toronto Pearson Travellers scour the baggage claim at Toronto's Pearson airport for their luggage. Cold weather has caused a series of delayed or cancelled flights. January 7, 2014. (Randy Risling/Toronto Star via Getty Images) 1. LGA - New York LaGuardia Travelers wait on line to check-in at the Central Terminal at LaGuardia Airport in the Queens borough of New York, U.S., on Tuesday, Dec. 28, 2010. Passengers stranded when airlines canceled more than 6,000 flights amid a snow storm in the eastern U.S. may wait days for another flight as carriers move aircraft and search for seats on crowded planes. Photographer: Jin Lee/Bloomberg via Getty Images Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

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