Luis Enrique sets Nou record
Second-half goals from Mesut Ozil, Theo Walcott and Olivier Giroud helped the Gunners return to form with a 3-0 win on Tuesday.
And as the points slipped away, certain sectors of the Hammers support began to brawl.
The defeat means West Ham remains in 15th position, just five points clear of the relegation zone.
