Staff have been working to repair a Nottingham school after it suspected eco-protesters used it as a base.
Doors and windows were smashed at the Iona School in Sneinton during a raid early on Monday.
Altogether 114 people allegedly planning a protest against the Ratcliffe-on-Soar power station were arrested then bailed without charge.
It is still unclear why the school was targeted, but staff there are adamant it has nothing to do with the protests.
Doors in the nursery were broken and glass trodden into carpets.
School administer Nigel Revill said: "We still don't know the whole story. We don't know how the protesters gained access, all we do know is just what's been left behind and the damage caused by the police gaining access."
A police investigation is under way but detectives said it could take several months before any charges were brought.
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Police arrested 114 people suspected of organising a power station protest
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