Reds match the target for suicide bombers?

The ten, who are still being questioned by police on suspicion of terririst activities, are believed to have tickets for Saturday's game at Old Trafford.

But the Greater Manchester police said that speculation hat public buildings in Manchester were targets for terrorists was "extremely unhelpful" and urged the public to be vigilant.

Manchester United director of communications Phil Townsend told BBC Five Live Breakfast: "Old Trafford has not been identified as a target.