Almost 400 activists have been arrested during a two week sit-in at the White House, in Washington DC, against plans for a new oil pipeline.
The proposed Keystone XL pipeline would take oil from the environmentally disastrous tar sands in Canada as far as Texas, crossing over 70 rivers and streams along the way.
There have already been 14 spills on the existing Keystone pipeline since it opened in June 2010.
A recent report projects that the new pipeline will suffer 91 serious spills in its first 50 years. Nasa climatologist James Hansen was among those arrested in the protests.
The US State Department has said that Keystone XL would have “no significant impact” on the environment.