Supporters of the home team broke through a fence and attacked West Ham’s contingent seated in a reserved section behind their own team’s bench at the AZ Stadium.
A scuffle ensued in which West Ham players, including captain Declan Rice, tried to intervene, with several running to the aid of relatives.
Police and stewards quickly arrived at the scene to prevent further confrontations, and calm was restored after 10 minutes.
Dutch police told the ANP news agency on Friday that they have not yet made any arrests, but will review the footage to see if there is any criminal responsibility that could warrant an arrest.
There were also incidents outside the stadium, including around the station in Alkmaar, the police said.
“It’s annoying, it has no place in our stadium. Preferably in any stadium,” said AZ coach Pascal Jansen, whose side lost 1-0 on Thursday as West Ham completed a 3-1 aggregate win to reaches the final with Fiorentina, in Prague, on June 7.
“I feel ashamed. You have to control your emotions, even on a losing night.”
Defender Pantelis Hatzidiakos was among several AZ players who spoke out against the violence in post-match interviews.
“I think it’s sad what happened. My family was up there. I got in touch with them and my girlfriend told me they were shaking,” he told Dutch television.
“I don’t even call them supporters. Stay home if you have such intentions. Such a beautiful evening, such a good atmosphere, I really enjoyed it until the final whistle. What happened after that seems very sad and pity”.
West Ham manager David Moyes said the incident had overshadowed the club’s Premier League performance.
“There was nothing we could do, or that West Ham as a club could do. Like anyone, if you saw your family members in trouble then you would go and help and that was the situation.” , Moyes told reporters on Friday.
“Unfortunately, it took up a lot of the news and time. But we’re not letting that take away from the fact that we’ve reached the final, which is a brilliant achievement.”
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