• City apology as defender is cut above eye
• Police arrest fan for running on to pitch
• Man City 2-3 Man United - match report
Manchester City issued a "wholehearted apology" to Rio Ferdinand after the defender was struck by a coin thrown from the crowd when celebrating Robin van Persie's late winning goal in the Manchester derby.
The Football Association announced it would investigate the incident, which came at the end of a tumultuous match in which a City fan was arrested after running on to the pitch following the Dutchman's injury-time winner and was intercepted by Joe Hart as he appeared to try and reach Ferdinand. Greater Manchester Police (GMP) also stated that another supporter was detained for a potential racism offence and that they are investigating alleged racist tweets.
United's 3-2 win ended the champions' 37-game unbeaten league record at home, and also handed them a first league defeat of the season to leave City six points behind them at the top of the table.
In separate tweets, the police said: "Man arrested inside stadium on suspicion of committing a racially aggravated public order offence after officers hear racist chanting." A second one read: "Thank you to everyone reporting racist tweets. We are aware and are investigating."
Of the Ferdinand incident, a club spokesperson said: "Manchester City FC security officials are co-operating fully with Greater Manchester Police in relation to events leading up to the throwing of missiles on to the field of play, and between the two sets of supporters, during today's game against Manchester United.
"Manchester City wishes to offer its sincere apologies to Rio Ferdinand. The club unreservedly condemns the actions which led to his being injured. GMP's review of all fan behaviour at today's match will be fully supported by the club, through the provision of CCTV footage and eyewitness accounts. Following this review, and any associated police action, the club will also apply its own disciplinary policies for any fans found guilty of offences."
Immediately after the match, Ferdinand tweeted: "what a result, 3points! Sweet! Whoever threw that coin, what a shot! Can't believe it was a copper 2p....could have at least been a £1 coin!"
Of Hart's intervention with the City fan, the defender tweeted: "Respect to Joe Hart for protecting that idiot who ran on!! Love the banter between fans but there is a point when it goes too far...calm it!"
Sir Alex Ferguson, though, struck a more sombre note. He told MUTV: "It's just disappointing at the end that a supporter ran on the field and Rio was hit with a coin in the eye. I don't know whether they are going to stitch it or not, we'll see. The same thing happened at Chelsea and it was all masked by the carry-on [involving Mark Clattenburg]. Half a seat came on and hit [Michael] Carrick and then coins, lighters, the lot – the game doesn't need that."
An FA statement said: "We will work with the clubs and authorities to identify those responsible and support the strongest sanctions available, including life bans. We condemn any such acts and it is simply unacceptable that any player is exposed to injury in this way. To witness Rio Ferdinand leaving the field with a cut above his eye to receive treatment is appalling."
In an unwaveringly dramatic game, Wayne Rooney put United into a 2-0 lead. Those goals took him to a record-equalling 11 goals in Manchester derbies, a total he shares with City's Francis Lee and Joe Hayes, before Yaya Touré and Pablo Zabaleta's second-half efforts drew the home side level.
After Phil Jones goaded the home crowd by celebrating before them after Van Persie's winner, and Carlos Tevez then had a touchline spat with Ferguson, Mancini afterwards insisted that they could still retain the title. "I am sure we can win the [FA Cup and Premier League] double. We have the spirit to recover six points, but we must now win four or five games in a row. For 20 minutes they didn't touch the ball and the first chance they got they scored a goal. We recovered very well and we dominated the second half."
Ferguson said: "Derby games are significant if you win them, but I hope it's really significant by the end of the season. I have not known many more dramatic days than that. You could not take your eyes off it. Today was a special one simply because they haven't lost at home for two years and both of us are contending at the top of the league."
Rooney added: "It feels fantastic. Especially with what happened last season [losing both derbies to an aggregate score of 7-1]."
Van Persie's winner came after Tevez, on for the disappointing Mario Balotelli – whose car was surrounded by United fans after the game – after 52 minutes, left the wall to make it only a three-man barrier. While Mancini said Balotelli was in danger of throwing his career "out of the window", he also questioned Tevez for leaving the wall during Van Persie's free-kick and criticised Samir Nasri, who turned away and then deflected Van Persie's shot past Hart.
"I understood before that the free-kick was dangerous. I called Carlos to return to the wall, but I was too far away," said Mancini. Of Nasri's half-hearted showing, he added: "We [only] had two and a half players there."Regarding Rooney, whose goals took him to 150 league goals and past Sir Bobby Charlton's club record derby mark of nine, Ferguson said: "He'll let us know about it." Vincent Kompany will have a test for a suspected groin problem while Jonny Evans pulled a hamstring.