Climate change groups have criticised Danish police for using heavy-handed tactics after they detained 968 people at a rally near the Copenhagen summit.
Mel Evans from Climate Justice Action told the BBC protesters were held for hours in freezing conditions without medical attention, water or toilets.
A police spokesman said almost all of those detained on Saturday had now been released, but a few would be charged.
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The World Development Movement's director, Deborah Doane, condemned the authorities for what she said was a "complete violation of the right to protest and a step towards the breakdown of democracy".
In a statement, Copenhagen police said a large group of protesters had organised themselves in a so-called "black bloc", in which they put on masks - an illegal action at a demonstration in Denmark. Officers then decided to "seal off" the group from the march.
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