Twenty different Manchester United and City players and staff were involved in an extraordinary tunnel melee after Sunday’s hard-fought match between the two sides, with Jose Mourinho at the heart of the fracas.

Mourinho reportedly had milk and water bottles thrown at him after he strode into the away dressing room to shout at City’s players for their noisy full-time celebrations.

He also became involved in an explosive row with City goalkeeper Ederson, after he shouted at City’s players to “show some respect” as loud music blared out.

But what really happened? And who is to blame? Here, we outline exactly what happened as tempers boiled over at the end of one of the most important matches of the season.

Manchester United vs Manchester City player ratings Show all 22 1 /22 Manchester United vs Manchester City player ratings Manchester United vs Manchester City player ratings David De Gea - 7 out of 10 Facing just one shot on target, the Spaniard will have been expecting a more taxing afternoon but nonetheless marshalled his backline well at set-pieces. 2015 Manchester United FC Manchester United vs Manchester City player ratings Antonio Valencia - 5 out of 10 Was exposed all too often by City’s faster and more industrious talents before becoming a liability when the anarchic Kevin De Bruyne switched sides. 2015 Manchester United FC Manchester United vs Manchester City player ratings Phil Jones - 7 out of 10 Reduced Wilfried Bony to a mere irritant rather than a credible threat, forcing the Ivorian striker out wide to search for scraps which seldom came his way. 2015 Getty Images Manchester United vs Manchester City player ratings Chris Smalling - 7 out of 10 Described by his captain as ‘one of the best three centre-halves in the world,’ the England man continued his impressive start to the season with another assured outing. 2015 Getty Images Manchester United vs Manchester City player ratings Marcos Rojo - 8 out of 10 Delivered a minor masterclass in the art of man marking to nullify Kevin De Bruyne’s threat as the Belgian endured a frustrating afternoon. 2015 Manchester United FC Manchester United vs Manchester City player ratings Bastian Schweinsteiger - 7 out of 10 A calming presence amid a hectic midfield battle, the experienced German made amends for his lack of pace with pin-point accuracy on his distribution. 2015 Manchester United FC Manchester United vs Manchester City player ratings Morgan Schneiderlin - 7 out of 10 Shadowing the imperious Bastian Schweinsteiger in the centre, the former Southampton man ghosted into pockets of space carelessly afforded to him by his City counterparts. 2015 Manchester United FC Manchester United vs Manchester City player ratings Juan Mata - 7 out of 10 Surrendered possession cheaply in the opening period but become more of a menace after the restart, in a more advanced role just behind Wayne Rooney. Getty Images Manchester United vs Manchester City player ratings Ander Herrera - 7 out of 10 Perhaps unfortunate not to be awarded a penalty after a tangle of legs with Raheem Sterling, the little Spaniard has a knack of finding himself behind enemy lines. 2015 Manchester United FC Manchester United vs Manchester City player ratings Anthony Martial - 6 out of 10 Had little room to manoeuvre on the left wing, a position Louis van Gaal has insisted upon lately, and inevitably cut an isolated and frustrated figure. 2015 Getty Images Manchester United vs Manchester City player ratings Wayne Rooney - 7 out of 10 After turning 30 on Saturday, the United skipper led from the front. Delivering a display epitomising his responsibilities, his most memorable contributions came in front of his own goal. 2015 Getty Images Manchester United vs Manchester City player ratings Joe Hart - 7 out of 10 Forced into making a decent save late on to deny Chris Smalling from point blank range, the England goalkeeper remained alert despite a largely uneventful shift. 2015 Getty Images Manchester United vs Manchester City player ratings Bacary Sagna - 7 out of 10 Refused to gallop down the line as often as City supporters would have liked, preferring to quell the dangers of Anthony Martial - to great effect. 2015 Getty Images Manchester United vs Manchester City player ratings Vincent Kompany - 7 out of 10 Booked in the first half for a succession of clumsy challenges, the Belgian was forced to walk on eggshells in the second period. Manchester United vs Manchester City player ratings Nicolas Otamendi - 7 out of 10 Rarely giving Wayne Rooney a moment of peace, the indomitable Argentinian defender is settling into his new role at City with the authority it demands. Manchester United vs Manchester City player ratings Aleksandar Kolarov - 7 out of 10 Dealt with the unpredictable nature of Juan Mata with swagger before enjoying a relatively uneventful final 23 minutes up against Jesse Lingard. 2015 Manchester United FC Manchester United vs Manchester City player ratings Fernando - 7 out of 10 An assured, if unremarkable, outing from the Brazilian meant it would have taken a Herculean effort by the United attackers to break the deadlock. Manchester United vs Manchester City player ratings Fernandinho - 6 out of 10 Impotent in front of goal and often absent at the back, this was an exasperating afternoon for the usually so comfortable midfield general. 2015 Manchester United FC Manchester United vs Manchester City player ratings Kevin De Bruyne - 6 out of 10 A marked man throughout, the Belgian was forced into rushing any opportunity which came his way. Enjoyed more success up against Antonio Valencia on the left. Manchester United vs Manchester City player ratings Yaya Toure - 6 out of 10 Sarcastic jeers greeted the Ivorian midfielder’s 77th minute substitution after he spent the afternoon trying and failing to singlehandedly bamboozle his way through United’s defence. 2015 Getty Images Manchester United vs Manchester City player ratings Raheem Sterling - 6 out of 10 Had the opportunity to wreak havoc down the right, up against a cumbersome Antonio Valencia, but his turn of pace proved more effective when tracking back. Manchester United vs Manchester City player ratings Wilfried Bony - 5 out of 10 Increasingly isolated in attack, this was an outing which will do little to silence the unhelpful – and unflattering - comparisons to injured Sergio Aguero. 2015 Manchester United FC

Full-time: Manchester City beat United 2-1 at Old Trafford

A surely seismic result in deciding where the Premier League title goes this season. City beat United 2-1 and extend their gap at the top to 11 points. They become the first team in English top-flight history to win 14 successive games in a season.

On the touchline, Jose Mourinho and Pep Guardiola shake hands. The former quickly disappears down the tunnel; the latter keeps his post-match celebrations to a respectful minimum.

Jose Mourinho quikcly disappeared down the tunnel (Getty)

Manchester City begin the party

As the players make their way down the tunnel and into their respective dressing rooms, City begin the party.

Their players triumphantly file into the away dressing room, stopping briefly to pose for photographers. Ederson animatedly pumps his fist for the cameras. Kyle Walker meanwhile makes a 2-1 gesture.

From the dressing room, Leroy Sane tweets a picture of all of City’s players grouped together in celebration. Somebody throws a handful of tickertape into the air and the music begins pumping.

Jose Mourinho goes to complain

The United boss is heading from his own dressing room to his post-match media obligations when he hears the noise from City.

He walks into City’s dressing room to make his feelings known. He says that City should “show some more respect”.

Jose Mourinho paid a visit to the City dressing room (Getty)

The row between Mourinho and Ederson ensues

After making his feelings known, Mourinho becomes involved in a row with the City goalkeeper, Ederson.

The two become involved in a heated exchange and begin trading insults in Portuguese.

Ederson enjoying the post-match celebrations (Getty)

The dispute turns ugly

Players from both sides now become involved as things turn ugly.

Milk and plastic water bottles are thrown at Mourinho, as United’s players rush to support him. Witnesses say some players attempt to swing punches as Old Trafford security staff rush to break things up. It has been claimed Romelu Lukaku was involved in the chaos.

In the melee, City coach Mikel Arteta receives a cut to the head which leaves him bleeding.

Arteta suffered an injury in the fracas (Getty)

After things cool down, police remain stationed outside both dressing rooms.

Press interviews begin

After the dispute, both managers conduct their post-match interviews as usual.

Mourinho concedes afterwards that City's advantage in the title race is now at a "significant distance".

Asked if it could be clawed back, he says: "I don't know. We are going to work and fight for it. That is the only thing I say."

He also complains about the late penalty decision, which saw United's Ander Herrera booked for diving after a challenge by Otamendi.

"It is a huge penalty in a crucial moment of the game," Mourinho says. He also bemoans his side's luck.