Kevin de Bruyne and Riyad Mahrez scored twice each as Manchester City outclassed rivals Manchester United to move six points clear of Liverpool at the top of the Premier League again.
De Bruyne slotted in the opener from Bernardo Silva's cut-back but Jadon Sancho levelled against his old club.
The Belgian popped up again after some shoddy defending from United and then set up Mahrez's half-volley.
Mahrez added a late fourth with a goal given by the VAR.
More to follow.
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