A schoolgirl with learning difficulties was gang-raped by up to ten thugs who then threw caustic soda over her.
They left her screaming in agony, with skin peeling off her face and body, as they ran away laughing.
The horrific attack has left the 15-year-old, who has a mental age of eight or nine, disfigured for life and severely traumatised.
First pictures of schoolboys jailed for gang-raping girl, 14, in horrifying punishment attack
Nine members of a braying schoolboy rape gang who carried out a horrifying punishment attack on a 14-year-old girl are behind bars today.
The boys were as young as 13 when they took it in turns to assault their defenceless victim while recording it on a mobile phone.
The rapists were a junior branch of a notorious east London gang known as the Kingzhold Boys....
.....The group moved to Trandescant House as Ibrabim began summoning more friends to the scene on his mobile.
'The victim knew, of course she was going to be raped again,' said the prosecutor.
'She could hear Ibrahim and others discussing her, saying there were other boys who would rape her badly.
'Eventually 15 boys assembled on the stairwell and she was 'raped repeatedly,' said Miss Merrick.
'The boys threatened her throughout, intimidating her and physically assaulting her.
'Ibraham slapped her face and pulled her hair whilst another banged her head against the wall and someone threw a bottle of water at her.
'She was spat upon, ejaculated on and abused whist she was on her knees in the stairwell.