Soccernet reports:
'The number of police officers on duty at Manchester United's Champions League match with Roma tomorrow has been increased after trouble at the two meetings between the clubs last season.
'Match commander superintendent John Graves said: "We have learned from last season's encounters and there were some aspects of the policing operation we needed to bolster and extend. We are covering at the airport and there is an operation in the city centre to keep tabs there. I'm confident I have enough resources available to me."
'Police spotters will be at Manchester Airport and in the stadium, and undercover officers will mingle with fans. Italian police will also travel to Manchester to help with the operation.'