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."
More top news
Theresa May will today announce details of a new mental health awareness course designed to help struggling teenagers.
A-level results will be on Thursday, but what should you do if your results are not quite what you had hoped for?
Away from the cloudier/damp southeast it's a day of sunny spells and showers on Thursday.