Ex-members use gym for topless bare-knuckle fights
A gym was used for late-night bare-knuckle fights after former members accessed the site, according to an email to members.
Large areas of Anytime Fitness in Penarth, Vale of Glamorgan, were left covered in blood after being accessed over the Christmas period.
The email, seen by BBC Wales, said former members had persuaded current users to let them in by claiming their access fob to the 24-hour gym was not working.
Manager Rae Carpenter said police dealt with the issue quickly.
The email said the gym had been accessed by former members who had been entering the site late in the evenings and carrying out "bare-torso boxing and bare-knuckle fighting".
It went on to say "noses were broken" and "blood was everywhere", adding staff had to "clear up blood splatters from equipment, walls and bathrooms".
The gym said the people had been identified and police had been informed.
Ms Carpenter said: "The police dealt with the situation seriously and quickly and we are very grateful. The safety of our club's community and security of the club is a priority."
South Wales Police has also been asked to comment.