Most of those aboard the escalator were CSKA Moscow soccer fans, according to local news outlet La Repubblica.
At least 20 people were injured when an escalator in the Rome metropolitan system collapsed Tuesday night (Wednesday morning NZ time).
Twenty people have been injured after an escalator malfunctioned and rapidly sped downward at a Rome metro station, leaving passengers in a jumble at the bottom, Italian officials say.
Sky Italia (via the UK's Daily Mirror) reports that the injured fans were from Russian Federation.
The paper also said that one of the victims was injured so seriously that the medics were forced to amputate a part of his foot.
Separately, one CSKA fan was slashed with a knife during clashes between opposing fans outside the Stadio Olimpico, the ANSA news agency reported.
Rome Mayor Virginia Raggi posted a Facebook live video from the scene and said that she expresses her "solidarity to the injured" and that authorities need to understand what's happened.
Witnesses quoted by police said the Russian fans had been singing and jumping before the escalator gave way.