Under-21s Manchester derby marred by crowd trouble

General view of the stadium before the Barclays Premier League match between Manchester United and West Bromwich Albion at Old Trafford on September 28, 2013
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Heated exchanges take place between Manchester United fans and Manchester City supporters during the Under-21s derby.

The derby between Manchester United Under-21s and their Manchester City counterparts on Tuesday evening has been marred by crowd trouble.

Unrest broke out in Old Trafford's J stand, with heated exchanges between the two sets of supporters forcing stewards to intervene, reports The Mirror.

A pitch invader later entered the field of play before being ushered off by United's Liam Grimshaw.

United won the clash 4-0 in front of 16,000 supporters, who took advantage of free admission, to take a step closer to the Under-21s league title.

Manchester United Manager David Moyes looks on during the Barclays Premier League match between Manchester United and Cardiff City at Old Trafford on January 28, 2014
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