There are clashes between Lazio ultras and riot police outside the Coppa Italia Final against Atalanta, where a police car was set on fire.
The problems broke out at around 18.10 UK time (19.10 local time), with kick-off set for 19.45 UK time.
Atalanta supporters were already in the Stadio Olimpico when the Lazio ultras began throwing bottles and fireworks at police.
The authorities responded with water cannon, tear gas and a brief baton charge.
Unfortunately, Lazio ultras have been in the news for all the wrong reasons several times this season and this is another blight on their already poor reputation.
The situation is particularly tense, because right next to the Stadio Olimpico is the Foro Italico, where the Rome Open tennis tournament is taking place.
The clashes seem to be in the Ponte Milvio area, where there are often dangerous situations involving ultras of both Roma and Lazio.
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