CORRECTED-UPDATE 3-Greta Thunberg detained at German mine protest, police say

(Corrects headline to clarify that Thunberg was detained but not arrested, spelling of town)

LUETZERATH, Germany, Jan 17 (Reuters) - Climate campaigner Greta Thunberg was detained alongside other activists on Tuesday during protests against the demolition of the coal village of Luetzerath but the entire group will be released later in the day, according to police.

"There is no reason to hold them for days. It might take hours or they will go immediately," a spokesperson for regional police in Aachen said, speaking about the whole group of demonstrators.

Thunberg was held while protesting at the opencast coal mine of Garzweiler 2, some 9 km (5.6 miles) from Luetzerath, where she sat with a group of protesters near the edge of the mine.

The clearing of the village in the western state of North Rhine-Westphalia was agreed between RWE and the government in a deal that allowed the energy giant to demolish Luetzerath in exchange for its faster exit from coal and saving five villages originally slated for destruction.

Activists have said Germany should not be mining any more lignite and should focus on expanding renewable energy instead.

Riot police backed by bulldozers removed activists from buildings in the village with only a few left in trees and an underground tunnel by last weekend, but protesters including Thunberg remained at the site staging a sit-in into Tuesday.

Thunberg was seen sitting alone in a large police bus after having been detained, a Reuters witness said.

"We are going to use force to bring you to the identity check, so please cooperate," a policeman said to the group, according to Reuters footage.

"Greta Thunberg was part of a group of activists who rushed towards the ledge. However, she was then stopped and carried by us with this group out of the immediate danger area to establish their identity," a spokesperson for Aachen police told Reuters, adding one activist had jumped into the mine.