Two Tottenham supporters ejected from the West Ham home end were attacked as they were escorted out of the London Stadium on Wednesday night.
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The incident occurred during the fourth-round Carabao Cup clash between the two teams - which Tottenham won 3-1.
The two Spurs fans were being ejected from ground when it was discovered they were sitting in the home end.
As they were walking down a flight of steps they were targets of verbal abuse before one supporter threw a drink in their direction.
As they continued to walk, video footage shows punches being aimed at them before stewards finally managed to bundle them away from the stands.
This wasn't the only incident to happen at London Stadium on Wednesday night as two pitch invaders managed to halt the game.
The first invader ran on as Tottenham were preparing to take a corner. After being removed, Spurs scored from the resulting cross with Fernando Llorente making it 3-1.
The second invader, wearing a Halloween mask, caused the second stoppage in the 90th minute. Both supporters will receive lifetime bans from West Ham as they launch an investigation into how both invasions happened.
The Premier League club will work with stadium landlords LLDC to find out how the two culprits evaded security while the FA will also look into it.
Manager Manuel Pellegrini said afterwards: 'Those things aren't for football. One of the most important things of the Premier League is how it is organised. It is not good for football.'
The LLDC are responsible for security and stewarding inside the London Stadium.
This comes less than a year after the high-profile incidents which marred the Hammers' Premier League game against Burnley last season, when there were four separate pitch invasions.
After those shambolic scenes, London Stadium stewards started to wear football boots, seemingly to help them chase anyone who managed to get on to the field.
Sulivan
2
fans need to learn to grow up, really.
gangsta
0
Believe me both sets of fans were in a lot of problems about that.
ruinous
0
The problem is the stupid stewarding in the ground. They channelled the opposing fans along a section separated by a fence where they wind each other up. Then the fence just ends and they pushed together. Dangerous.
boosters
0
Sorry to hear that
psalmson68
1
this shud b stopped in d modern day football cos of ur club is under performing doesn't mean dey can not do u gud next time. with dis all aggrieved fans should shun all illicit actns
Horlanrewahju
1
something should be done to West Ham for their unlawful act
Surrender
0
FA have been looking in to things for years and years whilst doing nothing. Lovely job!
dreamcup
0
Very brave or very foolish.
hero666
0
It's the 80's again!!
gangsta
0
Classy as usual then...