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A video emerged of an angry crowd of people confronting officers in Queens Square, Liverpool.
Merseyside Police were accused of giving the three children, including a girl, rough treatment.
Melissa Inman, who made the video public, told the Liverpool Echo : 'I witnessed police officers attack young kids, ragging them on the floor into the van.
'One kid's face was that red we thought he was going to pass out by how tight he was cuffed and how hard he was handled. It was disgusting!
'I am shocked at how the police handled this situation.'
The two boys and girl were arrested on suspicion of assault, drug possession and disorderly and threatening behaviour.
One person protesting against the police's actions shouted 'bully boys' at them.