West Ham and Rapid Vienna fans were seen hurling objects at each other during their Europa League tie.
The two sets of supporters clashed following Declan Rice's goal which put the Hammers ahead in east London.
Plenty of missiles were seen being launched from both groups of fans, with stewards struggling to get a handle on the situation.
Trouble had been brewing before Rice slotted home with West Ham players celebrating in front of the travelling support.
Stewards remained in the area as they tried to calm fans down, though Aaron Cresswell was almost struck with another object.
It is West Ham's first home European game excluding qualifiers, since 2006, having won at Dinamo Zagreb in their first match.
Rice had said: “It's only really started to hit me now how special that night was in Zagreb.
“We were in a European competition, for me and a lot of players for the first time, and it was just special. To get the win, to score and to have the fans there to celebrate with us was a really big achievement.
“But it means nothing if we don't go out there on Thursday night, in front of our fans, and get three points, which would see us start off with six from six. We really want to top this group and that's the objective.”
While boss David Moyes said ahead of Thursday's fixture: "It's incredibly exciting. It's an achievement where the players put an enormous amount of work in to reach. We'll have a huge crowd here tomorrow for a Europa League group-stage game.
"The players are in form and in good spirits, so we'll go into the game really positive."
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