West Ham beat Rapid Vienna 2-0 on Thursday night to maintain their 100 per cent record in the competition but there were a few unsavoury scenes in the stands.
Declan Rice tapped the home side in front during the first half following a lovely Hammers move. It was a joyous moment for the midfielder but one that sparked conflict in the stands between a pocket of home fans and the away end.
Bottles of urine were reportedly thrown from both sets of supporters, according to police officers at the game, while reports on social media suggested other objects were also launched.
The drama in the stands calmed down for the remainder of the game as Rapid were denied a penalty by VAR and Said Benrahma made the three points safe for the Hammers in second half injury time.
But once the full time whistle blew, some supporters in the away end once again found a wave of aggression crashing over them.
This time they chose to confront police offers who had made their way into the crowd in an effort to control the situation. Instead, supporters were caught on camera appearing to throw punches at the police.
It added a slightly sour note to what was supposed to be a night of celebration for the Hammers.
The clash marked the first time West Ham had played a competitive European match at home for 15 years, other than qualifiers.
Mark Noble was picked to start on the occasion as he continues his farewell lap – the midfielder is set to hang up his boots at the end of the 2021-22 season.
A fireworks and light display welcomed the players onto the pitch before the police were made to deal with a few flying sparks of their own in the stands.