Five members of a gang who beat and stripped a 16-year-old girl naked in a park before posting the photos on Facebook have been convicted.

Daniello Johnson, 19, of no fixed abode, Antonio Williams 19, London Road, Thornton Heath and Sian Roberts, 24, of Churchdown Road, Bromley, were all found guilty of false imprisonment, at Inner London Crown Court this afternoon.

Victoria Beckford, 27, of Hawke Road, Gypsy Hill, and Siobhan Vaughan 29, of Menlo Gardens, Croydon, were both found guilty of two counts of false imprisonment. The jury also found Beckford and Vaughan guilty of making incident photographs of a child.

The humiliating nude photographs were taken in Crystal Palace Park and added to the victim’s profile page on the social networking website – where they were spotted by friends and family who contacted the girl's mother.

The court heard during the ordeal on August 14 last the girl had been taken hostage by the gang as punishment for an unpaid debt of £100.

The victim, who cannot be named because of her age, was locked in a cupboard, punched and beaten with a leather belt before being stripped.

Jonathan Polnay, prosecuting, said the case concerned “a stupid teenage dispute over some money” that “got way out of hand”.

Jurors heard she was offered the choice of putting her hands in boiling water or being stripped, during the ordeal.

The girl was lured to Ferndale Road, Brixton, believing a friend was going to remove braids from her hair.

But Williams and Johnson, who tied her wrists with a dressing gown cord and then demanded her phone and PIN number, were waiting for her.

Johnson locked the girl in a cupboard for more than an hour, during which he slid the blade of a knife through the gap between the doors.

Roberts then arrived with Beckford and dragged her to a car and drove her around south London, collecting Vaughan and a 17-year-old boy from West Norwood.

With dusk approaching, the group headed to a poorly lit corner of Crystal Palace Park, where Beckford ordered the girl to strip, telling her: “This should teach you a lesson.”

The girl was offered the alternative punishment of immersing her hands in boiling water.

Mr Polnay said: “She chose to put her hands in boiling water but Miss Beckford decided that this was too cruel and demanded that she removed all her clothes.”

After the conviction Police Constable, Andrew Birks, from the Lambeth police CID said: "This is a horrific case where the victim was subjected to hours of abuse, assault and humiliation by five defendants who when arrested told police a string of lies to try and conceal their involvement.

"Through the bravery of that child, the jury has been able to recognise the truth behind the events of that day and to reach the verdicts that they have.

"The events themselves left a traumatic mark on her life, made worse by having to appear in court and relive them because these defendants continued their trail of deceit."

Williams and Johnson were arrested on August 17 and Roberts and Beckford were arrested six days later. Vaughan was arrested on September 20.