One Inter fan was killed, and four Napoli fans were stabbed before the teams' Boxing Day clash at San Siro, while racist chanting was heard throughout the encounter.
The 35-year-old Inter fan, who has not yet been named, was hit by a van and rushed to hospital, but later died from his injuries, as reported by Sky Sports. And, in an unrelated incident, four Gli Azzurri supporters were stabbed about an hour before kick off in Milan, during violent clashes between the two sides' ultras.
One of these fans required hospital treatment for a wound to his abdomen, and two Nerazzurri ultras have been arrested in connection with the crime in the hours since.