Antisemitic tweets posted in the aftermath of the North London derby are being investigated by police, according to the Press Association via The Guardian.
A spokesman from Scotland Yard was quoted as saying: "We're aware of antisemitic messages posted on Twitter following Arsenal v Tottenham on Saturday 4 January—an assessment is under way."
This took place as the England international was being stretchered off after injuring his knee in the 80th minute.
As is confirmed in The Guardian, Walcott's gesticulations saw him pelted with coins and led to an especially hostile atmosphere during the closing stages.
The Press Association reveals that messages containing references to the Holocaust are being investigated, and talks are ongoing with both clubs about missiles thrown onto the pitch.
Kick It Out has also given its support to police, passing on a number of offensive tweets themselves.
The entire event is being studied as part of "Operation Arrowtip," which investigates football-related crime, per The Guardian report.
Further comments were taken from a spokesman for Scotland Yard:
The Metropolitan police service is aware of incidents during the Arsenal v Tottenham Hotspur match on Saturday 4 January, where a number of objects were thrown from home and away sections of the crowd.
The MPS takes all such incidents seriously. Officers from Operation Arrowtip are investigating and are liaising with both clubs and the Football Association over these incidents.
As Rik Sharma reports in the Daily Mail, the FA has already been in contact with both North London clubs and a hefty fine may well be on the way.
Supporters found to have thrown objects onto the field may also receive lifelong bans from the stadium.
Walcott, however, won't be receiving any fine for his provocations, per Sharma, after the FA cleared him of any wrongdoings and simply "reminded him of his responsibilities."