The Splash star joined dozens of environmental activists outside the White House for a sit-in protest about a proposed plan to build the Keystone XL oil pipeline, which would stretch from Montana to Texas.

Hannah was taken into custody after refusing to obey orders from U.S. Park Police officers, who asked her to move on.

The actress was released after she paid a $100 (£62.50) fine, U.S. Park Police spokesman Sergeant David Schlosser tells Reuters.