Lead of operation into a series of sexual abuses Temporary Assistant Chief Constable Gary Calvert from Northumbria Police said the victims 'include teenage girls'.
He said it was a “sensitive investigation" which was still at a very early stage and moving rapidly.
I understand that these types of allegations can cause the public concern and I want to reassure the community that police take crimes of this nature extremely seriously and will thoroughly investigate them.
Our overarching priority is to protect any victims or potential victims and to bring any offenders to justice.
I must emphasise that the suspects do not come from one community but a range of communities and it would be very wrong to speculate until we have the full facts which may take some time.
The victims include teenage girls as well as young adults.
– Temporary Assistant Chief Constable Gary Calvert
Following the conclusion of the inquest into the death of Pc David Rathband, his wife Kath said in a statement that three and a half years ago her family's lives were "changed irrevocably".
In a statement read by her solicitor, she said: "Three and a half years ago, all our lives changed irrevocably. David fought so hard to come to terms with the devastating injuries that resulted from the shooting and the effects it had upon us as a family.
"Whilst I have lost David, he has left me with two amazing children and he would be immensely proud of them and what they are achieving, as am I."
Hero Pc David Rathband was found dead at his home after an affair with a survivor of the 7/7 bombing effectively ended his marriage, an inquest heard today.
Mr Rathband's wife Kath, who is mother of 21-year-old Ash and Mia, 15, told the hearing her husband had several affairs with women, but his last with Lisa French, a survivor of the London bombing, ended their marriage.
Giving evidence, Ms French told the hearing Mr Rathband had expressed suicidal thoughts to her, but that he did not want to go through with it.
"He fought bravely and courageously for the whole six months that I knew him," she said.
She had been worried about his welfare and had recommended he needed very specialist support to get over the trauma, she said.