The extraordinary bust-up occurred outside the away dressing room following City’s celebration of their 2-1 derby victory over United. A melee developed which left Mikel Arteta, an assistant coach to City manager, Pep Guardiola, with blood on his face. Stewards and police were required to break up the opposing sets of players and staff.
The FA has asked for each club’s observations regarding the incident and on Wednesday extended the time allowed from 6pm on that day to the same time on Friday.
Both City and United are expected to argue they were the passive party in the disagreement, so the existence of CCTV footage might have allowed objective evidence to be examined by the FA.
However, it is understood that there are no CCTV cameras in the corridor so the FA’s hopes of being able to understand the precise chain of events appear remote.