Arsenal manager Arsene Wenger says he is in the dark over the reasons behind the post-match altercation between captain Robin van Persie and Newcastle goalkeeper Tim Krul.
A row was brewing between the Holland team-mates throughout Monday night's Premier League clash at Emirates Stadium, which the Gunners edged 2-1 thanks to Thomas Vermaelen's stoppage-time winner.
Van Persie had earlier cancelled out a Hatem Ben Arfa strike for the Magpies 60 seconds after the Frenchman had opened the scoring in the 14th minute.
His squabble with Krul came to a head after the final whistle when the two players squared up, with the Magpies goalkeeper having to be restrained.
Wenger was unaware of what prompted the incident, which saw both players handed bookings by referee Howard Webb.
"I don't know, is it history from Holland? Is it just today's story? I don't know," he told Arsenal's official website.
"They both looked a bit nervous. I have not spoken to Robin yet. I will find out but I am happy it stayed yellow and did not become red.
"He is absolutely committed and he gave everything again tonight. He got us a quick equaliser. But the whole team played very well and (Theo) Walcott also had an exceptional performance tonight."
Injured Gunners midfielder Jack Wilshere tweeted his support for skipper Van Persie moments after the incident.
He said: "Can't say we didn't deserve it! Why is Tim Krul crying as well? Obviously don't know about RVP'S temper! Don't mess with the captain! #AFC"