A crowded escalator sped up before collapsing at a Rome metro station on Tuesday evening, a total of 20 people were injured, seven of them seriously.

Iran Press / Europe: Authorities have opened two investigations after 20 people were injured. One man had to have his foot amputated after the incident. In the footage the escalator seems to speed up suddenly, hurling people down the staircase.

RAI, Italy's national television broadcaster, aired a video of the incident, showing the escalator suddenly accelerating, with people piling up at the bottom. The top part of the escalator remained mostly intact, while several steps at the bottom completely collapsed.

The incident happened at Repubblica metro station on Tuesday evening in what one witness described as “a scene from an apocalypse.”

Firefighters worked for around an hour to remove fans trapped between the metal plates of the escalator’s steps. Many of the injured were treated at the scene.

Italian media reported that the escalator broke after a number of young people singing and chanting started to jump up and down on it.

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