A possible attack pictured below is the latest to be investigated by officers following the two-day music festival at Manchester's Heaton Park that attracted more than 140,000 people.
Detectives from Greater Manchester say they are already investigating three serious assaults at the weekend event.
In total, police made 29 arrests plus a further 26 crime reports were submitted, the majority of which were for either assaults or public order offences.
Meanwhile, officers have confirmed that a man punched unconscious by an unknown man has since died.
Robert Hart was dancing with his girlfriend on Saturday night in front of the main stage when he was punched unconscious by an unknown man.
More top news
1953 World Sidecar Championship winner Stan Dibben returns to the Isle of Man next week to talk about his motorcycling career
Jose Mourinho is a step closer to becoming Manchester Utd manager after Louis van Gaal's turbulent two-year reign at Old Trafford ended.
Sir Paul McCartney revealed that he started drinking heavily and almost quit music after The Beatles split in 1970.