Was he at the game? This was from the BBC website.
"Football is a family event and the disruption that players and fans alike faced will not be tolerated," said Greater Manchester police chief superintendent Stuart Ellison.
"As soon as people were on the pitch, we immediately deployed our resources to the front of the stands, where they were able to keep the two groups of supporters apart and prevent any further disruption."
It seemed to take an age to see any significant amount of police anywhere. .The only thing stopping the Wigan fan's from walking into the city end was fear of what might happen if they did.