West Ham have confirmed they will issue life bans to any supporters found responsible for attacking the Manchester United team coach on Monday night.
Kick-off was delayed by 45 minutes for the final match at Upton Park after some fans pelted the bus with glass bottles and other missiles, smashing the windows.
And after the Football Association promised to investigate the “unsavoury incidents”, the Hammers released a statement condemning the actions of those supporters.
“We are aware that there were some supporters outside the Boleyn Ground who didn’t act in an appropriate way,” the statement read.
“It was an extraordinary night full of extraordinary moments in front of extraordinary fans, 99% of whom behaved impeccably and were a credit to the club.
“We have already had thousands of tweets and emails from fans to say how proud they were to be a part of such a special evening in West Ham’s history.
“However, we are aware that there were some supporters outside the Boleyn Ground who didn’t act in an appropriate way when the Manchester United team bus was damaged.
“That was not acceptable and we will work with the police to identify those responsible and ban them for life.”
West Ham went on to win the match 3-2, although United manager Louis van Gaal refused to blame the attacks for his team’s defeat.
Hammers co-chairman David Sullivan, meanwhile, told BBC Radio 5 live that the Red Devils should have arrived at the ground earlier.
“I don’t understand why United couldn’t get here at 4pm. They could have got here early. They knew it would be busy. It’s crazy,” he said.
“There was congestion in the street and they couldn’t get the coach in. There were people around the coach, but there was no attack on the coach.”