This was a thrilling derby but sadly there appears to have been an incident of racist abuse, with a supporter appearing to make a monkey gesture towards a Manchester United player in the second half.
With United leading 2-0, a number of objects were thrown by supporters in the home end when Fred went to take a corner in the 67th minute.
The Brazilian moved away from the corner flag before going back to take the set-piece.
City midfielder Fernandinho, along with other home players, urged the fans in that corner to calm down.
Play resumed a few moments later once referee Anthony Taylor picked up a number of objects in that area of the pitch.
Manchester City are now 14 points behind league leaders Liverpool.