Objects were thrown at Manchester City 's players in their 3-2 defeat to Wolverhampton Wanderers.
Following Raheem Sterling's penalty to open the scoring projectiles could be seen on the pitch, with Benjamin Mendy showing a hip flask to referee Martin Atkinson.
An announcement was read indicating that objects had been thrown, and the FA later told the PA news agency that it would be looking into the incident.
It comes after a number of incidents north of the border, with a bottle of vodka thrown at Rangers star Borna Barisic in their recent visit to Easter Road.
City had been reduced to 10-men early on but took a 2-0 lead, only for Nuno Espirito Santo's side to snatch a dramatic 3-2 win.
City went in front in the 25th minute through Raheem Sterling.
After Riyad Mahrez went down in the area, VAR gave the penalty and Sterling's initial effort was saved by Rui Patricio.
But the spot-kick was ordered to be retaken due to encroachment and, after the goalkeeper saved again, Sterling tapped in the rebound.
Sterling struck again in the 50th minute, breaking clear of the Wolves defence and lifting the ball over Patricio but Adama Traore gave Wolves hope five minutes later when he fired into the bottom
corner.
Wolves levelled eight minutes from time.
Traore nicked the ball off Benjamin Mendy, who was trying to shield it out of play for a goal kick, and crossed for Raul Jimenez to convert.
Wolves completed the turnaround in the 89th minute as Matt Doherty fired past
Bravo.
