A woman taken to hospital with head injuries after being crushed by a metal lawn roller as she slept in a tent has spoken of her shock.
Emma Winch, 26, is recovering at home in Bridgend after being hurt at Aberaeron Rugby Club in Ceredigion in the early hours of Saturday.
She had been due to to play in a women's match at the club.
Dyfed-Powys Police arrested 21 men, all from the Merthyr area, who were released on bail.
Ms Winch, whose club Pontyclun subsequently withdrew from the tournament, said she heard laughter and loud banging noises before the roller crashed into the tent she was sharing with two friends.
"I thought someone had jumped on it (the tent)," she said.
I just think it is one of those stupid things that people do
"The girls got out of the tent to call for help and they saw someone running off.
"I held my head and there was a huge lump there straight away.
"One of the girls thought I had broken my nose. My face was quite numb so I couldn't really feel much. I wasn't sure where it hit me.
"I was very shocked and I started shaking.
"I kind of stopped the roller with my head."
Asked what she thought of the people responsible for the incident she said: "I just think it is one of those stupid things that people do.
"They don't think about what could happen.
"There was obviously people in the tent because the other girls had only just got in it when it happened.
"Luckily I am OK now."
The rugby sevens tournament has been taking place all weekend
Ms Winch was treated at Bronglais Hospital in Aberystwyth where she underwent five x-rays. She was released on Sunday morning.
There are concerns she may have fractured her cheek bone and Ms Winch will have to call the hospital for her results on Tuesday.
Aberaeron Rugby Club is staging a sevens festival this weekend.
Glyndwr Evans, secretary of Aberaeron Rugby Club, said they were "very disappointed" at what had happened.
"We are pleased to say that the girl has been here this morning and she is making steady progress and she's going to be OK," Mr Evans said.
He said the organisers took action against the club involved in the incident - Merthyr Youth Team - and they have been taken out of Sunday's competition.
Ch Insp Robin Mason from Dyfed-Powys Police said a "pit" roller went into the camping area where people were staying for the rugby tournament.
"Unfortunately there were some people in the tent and a young lady received head injuries as a result of the roller coming into her.
"At the time those injuries were deemed to be very serious."
Mr Mason said officers investigating the incident had been unable to identify the individuals responsible which was why there had been so many arrests.
"There were a lot of people there, they appealed for witnesses to try and whittle down who was responsible for the act. Unfortunately, nobody was coming forward.
"The witnesses at the time were unable to provide us with the information which could identify specific individuals, they could only identify a group responsible. And without anybody in that group admitting responsibility the officers had no option but to arrest them all and take them into custody."
Ms Winch had been due to play in a women's match on the third day of the four day event.
Police said they are not yet certain who among the 21 men arrested was directly involved in moving the roller.
They are appealing for witnesses and say they will make decisions on possible prosecutions when they have a clearer picture.
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