BERLIN (AP) — Berlin's Brandenburg Gate will have to be cleaned at greater effort and expense than initially thought after climate activists sprayed orange paint on the German capital's signature landmark earlier this month, a company that manages official buildings in the city said Thursday.

Members of group used fire extinguishers filled with paint to spray all six columns of the gate on Sept. 17 — the latest in a series of eye-catching actions. It is best known for protests in which and block traffic, a polarizing tactic.

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