A gang of men from Derby has been convicted of systematically grooming and sexually abusing teenage girls.
Many of the victims were given alcohol or drugs before being forced to have sex in cars, rented houses or hotels across the Midlands.
One girl described a sexual assault involving at least eight men.
The nine men were convicted during three separate trials, culminating in the convictions at Leicester Crown Court of the two ringleaders.
Reporting restrictions had been in place until the end of the third trial.
Twenty-seven girls came forward to say they had been victims, the youngest of whom was 12 and the oldest was 18. Convictions have been achieved for 15 of those.
Liaqat and Saddique were said to be the leaders of the gang
Abid Mohammed Saddique, 27, and Mohammed Romaan Liaqat, 28 - both married with children - were said to be the leaders of the gang.
Saddique, of Northumberland Street, Normanton, Derby, was convicted of four counts of rape as well as two counts of false imprisonment, two of sexual assault, three charges of sexual activity with a child, perverting the course of justice, and aiding and abetting rape.
Liaqat, of Briar Lea Close, Sinfin, Derby, was found guilty of one count of rape, two of sexual assault, aiding and abetting rape, affray, and four counts of sexual activity with a child.
Both pleaded guilty to causing a person under the age of 18 to be involved in pornography.
They will be sentenced on 7 January.
Derbyshire Police said they believed no money changed hands between those involved, and said such instances of abuse were a growing problem in the UK.
Detectives said it had been the most horrendous case of sexual exploitation they had ever faced.
The undercover investigation by Derbyshire Police, Operation Retriever, was split into three trials which have run since February.
Speaking after the hearing, Det Insp Sean Dawson said: "These convictions have brought an end to a lengthy and complex investigation that has been brought to court thanks to the bravery of the victims in this case.
"These two men are predatory sex offenders who, with their associates, have systematically abused and raped teenage girls.
"We are shocked by the scale of abuse we have uncovered and the impact it has had on the girls who were the victims of these callous men.