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18 shoppers were injured on Saturday when a 150-foot escalator malfuctioned at the Langham Place shopping mall in Hong Kong. In the middle of a busy shopping day, the device suddenly started moving backwards at twice its normal rate, piling up shocked riders at the base. Stomach-churning video of the incident was caught on security cameras, and has gone viral on social media.

Here's another angle:

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Investigators believe that simultaneous failures of a damaged driving chain and a braking device allowed the accident to occur. Amazingly, the escalator had just passed a biannual safety inspection last week, on March 23. Evidently, that inspection was not very thorough.

The 45-meter escalators at Langham Place are some of the longest in Hong Kong.
The 45-meter escalators at Langham Place are some of the longest in Hong Kong.
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Two technicians have been arrested in connection with the incident, and charged with obstruction of justice. Even if they're found not guilty, chances are they're going to be out of a job.