There were problems again at the London Stadium, with arrests made after clashes between West Ham and Middlesbrough fans.
West Ham have launched an investigation following fresh reports of crowd trouble at the London Stadium on Saturday and vowed to take a "zero tolerance policy" against any "mindless individuals" found guilty.
Several arrests were made as clashes broke out between rival supporters outside the stadium in the wake of the Hammers' 1-1 draw against Middlesbrough.
The violent scenes marked the third time this season there have been disturbances at the ground.
West Ham's first Premier League home game at the venue, a match against Bournemouth, was marred by scuffles both inside and outside the ground, while last month's clash with Watford saw 10 people ejected from the stadium.