Manchester City defender Kyle Walker got into a heated confrontation with an Arsenal coach after his side lost the Gunners - and Erling Haaland ended up involved.
The incident took place shortly after the full-time whistle blew on a tense game, which saw Arsenal win 1-0.
It took until the 85th minute for the deadlock to be broken, Gabriel Martinelli's deflected strike leaving City goalkeeper Ederson wrongfooted.
That was enough to send the Emirates into raptures, and the atmosphere did not dampen on or off the pitch once the game concluded.
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Sky Sports cameras showed Walker and Haaland surrounded by officials and a member of the Arsenal coaching staff as the two teams returned to the tunnel.
And further footage later showed how the England international had squared up to Gunners set piece coach Nicolas Jover - who used to be at City.
Haaland then walked over to the pair and defended his team-mate, before the incident was broken up and both players were ushered away.
Zoomed in footage showed Jover waving his finger towards Arsenal star Bukayo Saka, who missed the game through injury.
It is unclear as to what caused the initial altercation between Walker and the set piece coach.
City boss Pep Guardiola remained tight-lipped on the situation in his post-match press conference.
He said: "I know what happened, but I don't want to say. They know it."
The Spaniard didn't appear particularly tense about the incident, however, as he laughed after delivering his answer.
On the match in general, Guardiola said: "We had our moments, they had their moments. The rest was equal, and in one action they won.
"Arsenal made it difficult. Congratulations to Arsenal - that's all I can do. We know exactly what we have to do, and we'll do it."
The 1-0 win moves Arsenal up to second, with Mikel Arteta's side level on 20 points with leaders Tottenham but behind them on goal difference leading into the upcoming international break.
City, meanwhile, drop to third after two successive Premier League defeats, with Guardiola's side being beaten 2-1 by Wolves at Molineux last Saturday.
Topics: Kyle Walker, Erling Haaland, Manchester City, Arsenal, Pep Guardiola
Ryan Smart