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The father of one of the injured children managed to tie the dog to a fence with a cardigan, before police arrived to transport it to kennels.
Adam Mulvey, who lives next to the park, said: "I got a knock on the door from a little girl telling us that there were several children trapped in the park with the dog, and one of them was my little girl.
"I could see her from the house and everyone else screaming, howling, it was just horrific."
Mr Mulvey said he ran outside, saw the dog and sat on it, before tying it to the fence.
"I'm a dog lover and it killed me to sit on it and hold its face to the ground. But it was a powerful dog - not a nice thing to happen," he said.
"My daughter's seven and she's got to have an operation now. They're looking at the possibility of having to have skin grafts.
"She's frightened of dogs now for the rest of her life and frightened of parks."
Fiona Richards, who lives opposite the park, said: "The dog was running around super fast biting every kid in there, I saw it grab a little one by the shoulder. It was bedlam."
Ms Richards' 11-year-old daughter was bitten on the thigh.
Another resident, Neil Wilkinson, said: "There were about 30 kids in there and the dog just arrived from nowhere.
"I got in and started lifting them up and out of the park. As I was doing it the dog leapt up and bit my son on the arm."
Stevie Brooke-Maddison was in the park when the dog arrived.
The 12-year-old said: "At first we were laughing, because it was just jumping up and being silly.
"And then one minute it just snapped and was being vicious and went for everyone.
"I climbed up a climbing frame but it jumped up and latched onto my leg, I was kicking but it wouldn't let go.
"I was crying and screaming and everything."
A spokeswoman for Northumbria Police said officers remained in the area to reassure people.