UPDATE!!!
Police are no longer looking for a teenage girl shown being beaten unconscious in a “horrendous” viral video - after it emerged her assailants had already been sentenced in 2011.

Chloe Willingham, 17, and Kelsey Dyson, 16, admitted breaking into the home of a 14-year-old girl and beating her up at Chester Crown Court.

They were caught after the video was circulated by schoolchildren around Merseyside.

The 52-second clip shows a girl in a bath being punched, kicked and stamped on before Willingham pours bathroom products over her unconscious body.

he video - recorded on a mobile phone by Dyson, who also took part in the attack - came back to light this week after it was circulated by schoolchildren in Cardiff.

Yesterday, police officers in Cardiff appealed for information saying they were concerned for the victim's welfare.

Detective Inspector Shane Ahmed of Cardiff CID, who was leading the investigation, said: “It is a horrendous, prolonged attack and it is made even more worrying by the fact that we don’t know who the victim is, where the attack has taken place or even if she is alive and breathing now."

But after warning other police forces in the UK about the video, officers were contacted this morning to say the case had already been solved.

When the girls were sentenced in November 2011, Judge Roger Dutton agreed for them to be named because he said the incident was so serious.

He said at the time: “This girl could have been very seriously hurt, particularly when you were stamping on her face.”

Willingham, of Belmont Road, Anfield, admitted aggravated burglary and actual bodily harm and was sentenced to three years behind bars.

Dyson, of Ampthill Road, Aigburth, was sentenced to a two-year detention and training order.

Speaking this morning, Mr Ahmed said: "While we are relieved that this girl's assailants were caught and sentenced for the attack, we would like to urge people using Blackberry messenger and similar applications to stay vigilant against videos like this and, if they do see something that worries them, to contact police.

"In this case, the victim survived her ordeal, but it was an extremely serious assault and we are pleased her attackers were brought to justice."

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Police are concerned for the welfare of a woman filmed on a mobile phone being subjected to "a horrendous, prolonged attack" in a bath.

The mobile phone footage was circulated on BlackBerry Messenger (BBM).

The identity of the victim and where she was is not known but footage of the assault has been distributed in the Cardiff area.

South Wales Police says officers were tipped off about the attack by a concerned parent.

The video shows a young white woman in the bath, in pyjamas, being assaulted by a girl in dark clothing.

The suspect has dark hair tied in a bun and appears to be wearing distinctive false eyelashes and black and white patterned ankle boots.

A second woman watches the attack and also takes part in it.

Det Insp Shane Ahmed, of Cardiff CID, said: "In the video, this girl is being absolutely beaten in a bath.

"She is repeatedly punched, kicked, her neck is stamped on, her head is hit against the bath," he told Cardiff-based Media Wales.

"The attack appears to continue after she falls unconscious, with bathroom detergents poured over her," he said.

"It is a horrendous, prolonged attack and it is made even more worrying by the fact that we don't know who the victim is, where the attack has taken place or even if she is alive and breathing now.

'Identify the victim'"We can tell from the labels on the products in the bathroom that this appears to have taken place somewhere in the UK, and we have contacted other forces to make them aware.

"Our priority is to identify the victim and ensure her welfare."

The video has been distributed via mobiles in the last 24 hours, added Mr Ahmed.

A 16-year-old girl arrested in connection with the incident has been released, a police spokesman said, adding: "It has been established that she is not one of the females in the footage and therefore no further action will be taken against her."