The Italian newspaper La Repubblica has compared the scenes to "urban warfare". The violence is believed to have taken place at the Drunken Ship pub - images on La Repubblica's website appear to reveal the damage.
The Lazio fans were reportedly armed with knives, baseball bats, belts and knuckle dusters and they went on to "destroy" the venue. One witness told the paper: "We feared the worst."
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Police say they have traced four drivers who are thought to have hit the woman, and added that a fifth vehicle may also have been involved.
Alex Rowley said he was "disappointed" that Scottish Labour Party were unable to fully investigate harassment claims against him.
Widespread frost, fog and icy stretches overnight. Rain for most during tomorrow