Fans clash with police at Man Utd
Police and football supporters have been involved in minor scuffles outside Old Trafford ahead of the Champions League match against Manchester United.
Greater Manchester Police officers made several arrests after a confrontation in front of the ground.
The situation involved several dozen mainly Roma fans and was soon brought under control by officers with batons and police horses and dogs.
Almost 4,000 Roma fans are expected at the quarter-final second leg tie.
BBC sportsnews correspondent James Munro described the atmosphere outside Old Trafford as "tense and unpleasant".
Police dog units and mounted officers became involved with a series of scuffles with supporters close to the club shop on Sir Matt Busby Way at about 1750 BST.
Fans are understood to have hurled bottles and missiles at police lines outside the ground. There are no reports of anybody being injured.
Police sources told the SSB that the "isolated" trouble - which involved fans of both teams - was contained within five minutes.
A police spokesman said: "There have been a few incidents but they have been fairly isolated and we are dealing with them as they happen.
"There have been some arrests to maintain the peace at the ground. The trouble has involved a mix of fans from both sides."
A reporter James Alexander said extra security was very much in evidence outside the stadium.
"There are lots of security personnel and extra police cars and vans around the stadium," he said.
"It has been classified as a Category C match which is the highest alert there is for a match at Old Trafford. It is on a par with a home match against Liverpool."
The visiting fans will be in the second tier of the East Stand, meaning they will be sat at the same end of the ground as United fans.
Roma's managing director Rosella Sensi earlier insisted their fans would behave impeccably.
Sensi said: "It is right to call for calm. But our fans know how to behave whether they are in Italy or abroad.
"It's a very important game for Roma but we are approaching it calmly."
Police quickly calmed the situation
The police match commander at Old Trafford is confident the match will pass off peacefully and that the Italian club's notorious fans will not travel.
Supt Charlie Coxon, of Greater Manchester Police, said: "History shows the ultras don't travel abroad.
"We have Italian police officers with us. If any of the known ultras do appear, they will see them.
"We have a full police operation at Manchester Airport to make sure everything is very safe. But we don't expect any of them to come."
The Independent Manchester United Supporters Association said trouble was not expected in the return match.
"We all need to make sure that there are no headlines in Manchester to wipe out the memory of those made by the Italian police last week in Rome," said IMUSA in a statement.
"The Roma fans at Old Trafford on Tuesday will be just like most of our fans who went to Rome last week and will be there only to watch the football."
Uefa is to investigate the trouble from the first leg, which could lead to disciplinary action for both United and Roma.
