Scotland Yard has launched an investigation into allegations of racist chanting by Millwall fans towards Tottenham forward Heung-min Son during Sunday’s FA Cup quarter-final.

The South Korea international was subjected to chants of “DVD” and “he’s selling three for a fiver” by a section of the travelling Millwall fans at White Hart Lane.

The reference to selling DVDs is widely known to be a racist term when aimed at Asian footballers.

Today the Met said it had launched an inquiry into the chants but there had been no arrests.

Detectives are working with Tottenham and reviewing CCTV footage inside the stadium of the alleged chanting at the game.

The Football Association have already said they will investigate the allegations and officials are studying referee Martin Atkinson’s match report, as well as observations from both clubs.

Son rose above the taunting during the match and delivered a fitting response by scoring a hat-trick as Spurs hammered their League One opponents 6-0.

Millwall are still under investigation by the FA after Premier League champions Leicester complained about their fans’ behaviour following their surprise victory in the previous round.

Tottenham Vs Millwall: Police struggle to control rival fans 9 show all Tottenham Vs Millwall: Police struggle to control rival fans 1/9 Tensions: police control fans prior to kick off PA 2/9 Rivalry: there were fears violence could erupt between the two sets of supporters PA 3/9 A smoke bomb thrown by fans outside the stadium PA 4/9 Police battle to keep fans at bay in north London PA 5/9 Some fans had to be restrained on the roads around the stadium ahead of kick-off PA 6/9 There was a huge police presence on the streets amid fears over fan unrest PA 7/9 Football fans gesture prior to the match PA 8/9 A group of fans face police officers before kick-off REUTERS 9/9 Football fans gesture on their way to the FA cup match PA 1/9 Tensions: police control fans prior to kick off PA 2/9 Rivalry: there were fears violence could erupt between the two sets of supporters PA 3/9 A smoke bomb thrown by fans outside the stadium PA 4/9 Police battle to keep fans at bay in north London PA 5/9 Some fans had to be restrained on the roads around the stadium ahead of kick-off PA 6/9 There was a huge police presence on the streets amid fears over fan unrest PA 7/9 Football fans gesture prior to the match PA 8/9 A group of fans face police officers before kick-off REUTERS 9/9 Football fans gesture on their way to the FA cup match PA

Any punishment for either issue, however, will be considered separately.

Millwall manager Neil Harris said after the match he had not been aware of the chants but accepted that, if proven, they would represent a blot on his side’s excellent run in the competition.

“I didn’t hear anything, but the club, we won’t condone that,” Harris said. “We came here in the right spirit, to enjoy an FA Cup quarter-final, so if that’s proven to have been to the detriment of the competition then I’m sure it will be left to the authorities. We just want people to enjoy the game.

“Of course it’s a shame, for both of us — Mauricio (Pochettino) wants to be talking about his team’s quality.

“The focus comes away from what we’ve achieved in the competition. It’s wrong in society and it’s wrong in football.”

Two people were arrested during skirmishes between the rival supporters before the kick-off with bangers, flares and bottles being thrown.

The Met said today: “The Metropolitan Police Service is currently investigating allegations of racist chanting towards a Tottenham Hotspur player during Sunday’s FA Cup match against Millwall Football Club.

“Detectives in Haringey CID are working with Tottenham Hotspur Football Club in reviewing CCTV footage from within the stadium during the match. To date there have been no arrests and the investigation remains ongoing.”