Lancashire Police helped Manchester colleagues as ugly protest broke out at Old Trafford
Lancashire police resources were sent to assist officers in Greater Manchester as a violent protest broke out at Manchester United FC's ground at Old Trafford on Sunday.
It is understood officers called on other forces for assistance as hundreds broke down barriers and poured on to the pitch, setting off flares and climbing goalposts, in protests against the owners of Manchester United.
A police officer suffered a "significant slash wound to his face" and required emergency hospital treatment.
The incident follows the club's failed attempt to join the controversial European Super League.
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