West Ham fans appeared to mock the gassing of Jews in the Holocaust on Sunday as Tottenham supporters were allegedly subjected to a second dose of anti-Semitic abuse in the space of four days.
Tottenham ended their three-match losing streak with a fine 3-1 win over the Hammers that was inspired by excellent performances from Jermain Defoe and Gareth Bale.
But once again, the match was overshadowed by controversial chants from the opposing supporters.
Just a matter of days after Ashley Mills was stabbed in an anti-Semitic attack before Tottenham's game in Rome, West Ham supporters sang "Viva Lazio", "Can we stab you every week?" and hissed on several occasions, apparently mocking the mass execution of Jews during the Second World War.
Both managers were reluctant to comment on the matter afterwards as they said they were not aware of the chants.
"I didn't hear it," West Ham boss Sam Allardyce said.
"I don't hear what the fans say or do when I'm concentrating as a manager on a game of football.
"They shouldn't be doing things like that, it is the least of my worries at the minute isn't it?
"What do you want me to say? If I didn't hear it I can't condemn it can I?
"I will wait and look at it myself and make a comment once I have listened to what they have said.
"I don't want to be a political animal, I'm here to talk about football and not what fans are saying and singing."
Tottenham manager Andre Villas-Boas said he did not want the issue to detract attention from what was Tottenham's best home performance of the season.
"I prefer not to mar the performance with a situation like this," the Spurs manager said.
"You know the animosity there is between Tottenham and West Ham and as long as it doesn't reach stupidity it is a great, great rivalry of two London clubs.
"It would be extremely unfair for me to mar the performance of the players but understanding that a couple of situations are avoidable but we can't decipher the true meaning of what they were saying."
Defoe's marvellous solo effort put Villas-Boas' men ahead just before the break and Bale made it 2-0 after the restart when he prodded home Clint Dempsey's clever chip.
Defoe then put the game to bed by converting Aaron Lennon's pass in a rapid counter-attack before Andy Carroll's first West Ham goal gave the visitors some consolation.