A man has been arrested after a fight allegedly broke out during a performance of Swan Lake at Manchester Opera House.
Witnesses saw two men arguing during the interval, before one started "punching" the other in the face, according to reports.
One horrified member of the audience said one man "had blood all over his face".
"Still can't get the image out of my head," she wrote on the social media platform X, shortly after the incident.
Greater Manchester Police said officers went to the venue following reports of a disturbance at around 8.35pm on 21 January.
A spokesperson said: "A 30-year-old man was arrested on suspicion of assault."
He was taken into custody and later released pending further investigation.
Police are continuing to investigate the incident, the force spokesperson added.