Police are stepping up patrols around Manchester's student areas after a series of rapes.
In the latest attack a student was dragged down an alley and raped in Fallowfield early Saturday morning.
Greater Manchester Police said it was a "harrowing and deeply distressing attack".
Ralph Blunsom reports:
5 of the girls are from Longsight, 2 from Stockport. 3 of the people were arrested in Oldham. Alleged crimes are centred around Longsight.
The arrests took place over several months , beginning with the first at the end of August.
More on the 11 ppl arrested as part of crackdown on child sexual exploitation in Manchester. 9 men, 2 women. 7 victims, all girls aged 13-17
- Visit www.itsnotokay.co.uk for information for children, young people, parents, carers and professionals on how to spot the signs of child sex exploitation and what to do about it.
- To speak to the police's Protect team email: email@example.com or call 0161 226 4196.
- Anyone who is concerned about a child or young person should call Greater Manchester Police on 101 or 999 in emergencies, or Crimestoppers on 0800 555 111.
- For more information about Barnardo’s visit www.barnardos.org.uk.If you are a child and you want to speak to someone in confidence about any issue that is upsetting you, you can contact ChildLine on 0800 1111 or go to www.childline.org.uk to chat to a counsellor in confidence.
- If you are an adult and you have concerns about a child you can speak to the NSPCC adult helpline on 0808 800 5000 or email firstname.lastname@example.org
Today's arrests were part of an operation code-named Op Heliodor, which was launched to combat child sexual exploitation and part of Project Phoenix - the campaign tackling CSE across Greater Manchester.
The team is made up of police, children’s services, health services, and Barnardos and covers Salford and Manchester area.
“We are pleased to be at the heart of an inter-agency partnership in Greater Manchester tackling child sexual exploitation; supporting and enabling young people to speak out and providing child victims of sexual exploitation with appropriate, long term support.”
Greater Manchester Police said the arrests came after a week of action to "help prevent child sexual exploitation and raise awareness of the issue" and the launch of the campaign – “It’s Not Okay”.
The campaign hopes to protect children at risk by increasing people’s understanding of child sexual exploitation and how to spot the warning signs of CSE.
Eleven people were arrested in a new crackdown on child sexual exploitation in the south Manchester area.
Police held the suspects, aged between 19 and 38, after raiding six addresses in connection with offences including sexual activity with a child, attempted indecent assault, inciting a child into prostitution, abduction and rape.
“Tackling child sexual exploitation and those responsible for such heinous crimes is an absolute priority for us.
“I want to assure our communities that combatting CSE is a Force priority for GMP and we would encourage anyone who is a victim of this kind of abuse to come to either us, a family member or the charities and support agencies who are out there and help us bring the offenders to justice."
Police are hunting a rapist who dragged a student into an alleyway and as she walked home from a night out in the city centre.
It happened around 3.40am on Saturday 25 October, the 19-year old victim was walking down Ladybarn Lane in Fallowfield when she was approached by a man who offered to walk her home before attacking her.
The offender is described as black or Asian, about 5ft 9in tall with a slim build and very short black hair. He was clean shaven and was wearing baggy blue or grey jeans and a long-sleeved top.
A drunken man who was arrested in Manchester demanded an interpreter after telling police he would only speak in Welsh. Officers spent four hours trying to find a Welsh language expert to deal with the man, 26, who could speak perfectly good English.
But they failed to find a translator and had to let him go without charge.
...D&D Sackville St - bailed..despite speaking English in custody all day, insisted on Welsh interpreter which we struggled to find...
...and no, it's not a dig at the Welsh; just frustration + feeling that someone was being difficult needlessly.
Officers went onto Twitter to blast the "difficult and time-wasting" prisoner who was arrested at 2am for a public order offence in Sackville Street, Manchester.
Their official tweet said: "Drunk and disorderly - despite speaking English in custody, insisted on Welsh interpreter which we struggled to find.
"And no, it's not a dig at the Welsh, just frustration and feeling that someone was being difficult needlessly."
The un-named man was bailed to return to the police station when sober and he accepted an £80 fixed penalty fine - written in English.
We spent several hours trying to find an interpreter for the man who has Welsh roots. He's wasted his own time and our time. At least he saw sense in the end.
A "shocking and blatant" teacher who groped boys during primary school lessons has been jailed for four years.
Anthony Kerr, 71, of Netherlees, Oldham, had earlier pleaded guilty at Manchester Crown Court to 29 historical offences of sexual assault.
The offences relate to sexual abuse of nine boys during their time a school in Greater Manchester between 1979 and 1982.
Nine victims told the police that Kerr would encourage boys to sit on his knee at the front of class while reading out load.
He would then sexually assault them.
In addition to his four years imprisonment, Kerr was ordered to sign the Sex Offenders Register for life.
Kerr's shocking and blatant abuse of innocent children has left a lasting scar on all his victims.
"Not only did he sexual abuse young boys, but he did it in front of the whole class. This added an extra element of humiliation to his crimes as the abuse was common knowledge among classmates.
"Without the bravery of all his victims, particularly the first one to come forward, we would not be in a position to see Kerr finally receive his punishment.
"Their courage should hopefully encourage any other victims of sexual abuse to now come forward and speak to the police."
A teenager suffered a stab wound to his leg after being attacked in Salford.
The 18-year-old man was cycling along Bolton Road in Irlams O Th Height when he was attacked yesterday afternoon.
Four men got out of a car and one of the group was heard to say "stab him".
The teenager was stabbed in the leg. He suffered a 10cm deep wound which needed hospital treatment.
After the attack, the victim ran to a nearby dental surgery to raise the alarm and the four men drove off.
The attackers have not been described but police are appealing to anyone with information about the stabbing to come forward.
"We are dealing with what appears to be a random, motiveless attack on a young man.
"He was out minding his own business with his friends when he was attacked for no apparent reason, suffering a serious and deep stab wound to his leg which has needed hospital treatment.
"We need to find the culprits and I would encourage anyone who has information about what happened to come forward and help us.
"If you know what happened, or you witnessed the attack itself, or perhaps you suspect who may be responsible, then please call us."
Anyone with information is asked to call police on 0161 856 5351 or Crimestoppers on 0800 555 111.