At around 6.30pm yesterday evening (Wednesday) police received reports that a dog had bitten a number of children in the park next to Burns Avenue in Blyth.
Police have this morning, (Thursday, May 19), arrested a 37 year-old woman on suspicion of having a dog dangerously out of control.
The animal is believed to be a Staffordshire bull terrier type dog and remains in secure police kennels.
Eleven children were taken to hospital for treatment to puncture wounds. Three of the children were kept in hospital overnight for treatment.
Extra officers are in the area speaking with people and offering reassurance.
Anyone with concerns or any information to help is asked to contact police on 101 quoting reference 0945 18/05/16.