Hundreds of supporters were caught up in ugly scenes outside Old Trafford before Tuesday night's game as a stand-off ensued between rival fans, who were separated by riot police and dog handlers.

Greater Manchester Police said one man was being questioned at Swinton police station regarding public order offences, while a 25-year-old from Chorlton has been bailed on suspicion of breaching a football banning order.

The remaining three men who were detained were released without charge.