The first Manchester derby of the season ended in a resounding victory for the Premier League champions, as City showed they are several classes apart from the United.
Erling Haaland scored twice and Phil Foden also got on the scoresheet on a day that started on a solemn note, with the late Sir Bobby Charlton remembered ahead of kick-off.
United and England legend Charlton - a World Cup, European Cup and Ballon d'Or winner - died last weekend, aged 86, three years on from his dementia diagnosis being made public.
Banners and mosaics commemorating Charlton were visible in the stands as the players walked out onto the pitch at Old Trafford, and there was also a minute's applause prior to the start of the game.
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