Rapid Vienna fans attempt to attack the West Ham section of the crowd as violence erupts in the Europa League clash at London Stadium.
Austrian supporters reacted as Declan Rice fired the hammer into the 28th-minute lead in a 2–0 victory.
A large number from the guest end overcame the barriers and tried to move between the home sections.
There was a dispute between the two rival fans even before the kick start.
Visiting support turned against West Ham fans ahead of a light show celebrating the London club’s first home game in the Europa League.
With the ground in virtual darkness, several bottles of water were launched between two sets of supporters separated by a gap of three meters in the corner of the field.
Once the lights came back on, the throwing stopped briefly – but after about 20 minutes of action there were occasional missiles being exchanged between rival fans.
Then when Rice opened the scoring on 28 minutes, it sparked wild celebrations and taunts from Hammer fans – causing fury in the Vienna group.
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Traveling supporters mounted advertising billboards and tried to drive away Hammer fans, with 30-40 attempting to break through.
The stewards fought hard to hold them back before they were joined by the police as the officers managed to bring the situation under control before it turned into chaos.
In the scuffle, huge water bottles used on water coolers were being thrown at each other and other things were being thrown.
Missiles were also thrown at Hammers star Aaron Creswell as he made his way past Vienna fans to take corners before half time.
Trouble resumed after the game as oncoming fans attempted to break through their section into the home stands, while bottles were thrown again by a group of Hammer fans who lived inside the stadium.
Further trouble escalated when home security clashed with officers arriving from Vienna dressed in club clothes, who appeared to be pro liaison officers.
One in particular caused fury with the stewards holding him against a wall under the stand while seeking to arrest him.
The anger eventually cooled but the group of staff were ordered out of the stadium instead of waiting for the police – who by that time had been forced to go out in two groups armed with riot gear.
David Moyes said: “Look, we want to be a club regular in Europe and because of that we want to be treated right.
“I don’t know who started it but we don’t want that reputation, we want to be seen as a club that can travel to Europe and everyone welcomes us.
“I knew some things were being thrown.”
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