The atmosphere at the London Stadium on Saturday afternoon was toxic as supporters protested against the club's board.
Two supporters made their way onto the pitch after Ashley Barnes opened the scoring in the second half. There were further incursions as Burnley won the game 3-0.
West Ham captain Mark Noble - who later called the atmosphere "horrible" - confronted one of the pitch invaders. Another took hold of a corner flag and attempted to plant it in the centre circle. Police said there have been two complaints of assault following the match.
Late in the game, cameras captured joint-chairman David Sullivan as he was being advised to leave his seat in the stand. There were concerns for his safety. It was no game for Sullivan and neither was it for young fans. Some parents removed their children from the ground.
The Burnley bench was also a safe haven for young supporters. Having left the game five minutes before Ashley Barnes's goal, Jeff Hendrick gave young fans refuge.
In a message sent to Stand Collymore, one parent said:
"Was just wonder if you could get a message to Jeff Hendricks at Burnley please. During the trouble at West Ham he looked after my son and gave his boots. He turned a bad day into a magical one and I am incredibly grateful."
Another parent also sent her thanks via Twitter.
@JeffHendrick92 @BurnleyOfficial Huge thank you for keeping my son safe at the game today and turning a potentially terrifying experience into a memorable one. Can’t thank you enough. pic.twitter.com/mDVzF6VxpN
— Danielle Smith (@Daniell77223484) March 10, 2018