The U.S. Coast Guard temporarily detained two dozen protesters who formed a blockade with kayaks and other vessels Monday to try to stop Royal Dutch Shell’s drill rig as it left Seattle on its way to explore for oil in the Arctic Ocean.

The protesters were scooped up from the water because they were violating the safety zone around the Polar Pioneer, which departed around 6 a.m., Coast Guard Lt. Dana Warr said. They were released after receiving violation notices that carry fines, the Coast Guard said.

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