Thirteen men have been sentenced to more than 150 years in prison for child sex offences.

Four more men will be sentenced tomorrow at Leeds Crown Court and they include a Huddersfield man.

Mansoor Akhtar, 25, has been found guilty of one charge of sexual activity with a child and a charge of supplying Class B drugs.

The offending mainly took place in Halifax and Bradford between 2009 and 2011.

One victim was sexually assaulted. The other victim was systematically abused by many men, most of them from the Halifax and Bradford areas..

The conclusion of the trial is the culmination of a four-year investigation by West Yorkshire Police which resulted in 25 defendants being charged in December 2014 with offences including rape, trafficking for the purpose of sexual exploitation, sexual activity with a child, sexual assault, voyeurism, sexual grooming, conspiracy to engage in sexual activity with a child under 16, causing a child under 16 to engage in sexual activity without consent and supply of a controlled drug of class B.

Three separate trials have taken place between February and June 2016.

The 13 defendants sentenced to date have amassed 156 years and six months imprisonment between them, with sentencing ranging from five to 25 years.

Peter Mann, Head of the Complex Casework Unit, CPS Yorkshire and Humberside said:

“We have worked closely with our colleagues at West Yorkshire Police since the start of this complex and lengthy operation.

“These men are responsible for a range of crimes involving child sexual exploitation and abuse.

“ Both these young women have shown immense courage and bravery in reporting these matters to the police and in providing evidence to enable us to bring a strong prosecution case to put before a jury.

“ This case sends out a very clear message to all those who may be hesitating about coming forward to report matters such as these. Make no mistake - we will not tolerate this type abuse on our streets or in our communities. We will not hesitate to bring dangerous criminals who carry out acts of sexual violence to justice.”