Inter Milan ultras staged a mass walkout during the club's win over Sampdoria to pay tribute to a former leader who was killed in an ambush.
Vittorio Boiocchi, 69, was shot dead near his home in the Figino district of Milan on Saturday evening.
Boiocchi had previously served as one of the leaders of the historic club's ultras, leading to some of the fans in attendance to collectively pay tribute.
With the Nerazzurri heading into the interval with a comfortable 2-0 lead, some of the club's fanbase elected to leave the stadium to commemorate Boiocchi, leading large swathes of the San Siro empty for the second half.
However, according to reports from Football Italia, the ultras leaving the stadium attempted to force other Inter fans to leave under the threat of violence.
One fan later detailed his experience during the incident on social media: 'Last night I was in the Curva Nord. I was threatened to be beaten up if I didn't come out.
'I saw a man being punched in front of me because he wanted to assert his sacrosanct right to watch the game. I hope the club will take action.'
The actions of the ultras during the interval has led to widespread condemnation across social media with @valeriolafrate describing the incident as 'one of the blackest pages in the recent history of the relationship between organized supporters and clubs.'
Another user expressed their disdain with the actions of the group: 'Can we say that the Curva Nord is embarrassing or should we go on with the farce of "real fans"?'