Eleven children were injured when a dog attacked them in a playground in Northumberland.
Parents described rushing from their homes to pull the animal away from the children in Blyth.
It happened on Wednesday evening and three of the victims spent the night in hospital.
A 37-year-old woman was arrested on suspicion of having a dog dangerously out of control. The dog has been taken to police kennels.
3. Public Spaces Protection Orders
Some public areas in England and Wales are covered by Public Spaces Protection Orders (PSPOs) - previously called Dog Control Orders (DCOs).
In public areas with PSPOs, you may have to:
keep your dog on a lead
put your dog on a lead if told to by a police officer, police community support officer or someone from the council
stop your dog going to certain places - like farmland or parts of a park
limit the number of dogs you have with you (this applies to professional dog walkers too)
clear up after your dog