The FA has told ESPN it will investigate anti-Semitic chanting by West Ham fans during the club's 3-1 defeat at Tottenham on Sunday.
Throughout the 90 minutes, sections of the visiting support at White Hart Lane aimed chants that were either anti-Semitic or goaded their home counterparts about violent attacks on some Spurs fans before the club's Europa League game against Lazio in Rome last week.
They made hissing sounds early in the first half - a reference to the gassing of Jews in concentration camps during the Second World War - and chants of "Adolf Hitler's coming for you" were heard.