Danish police have again arrested large numbers of demonstrators at the United Nations climate conference in Copenhagen.

Between 100 and 200 people were picked up in the city's harbour district. Some of those detained were carrying weapons and the authorities suspect they were planning to blockade the port.

Earlier this weekend, nearly 1000 protesters were arrested in Copenhagen, but they have all now been released. Many have criticised the police for being far too heavy handed and this has been corroborated by eyewitnesses.

photo: Copenhagen protests (EPA)