In the US state of North Dakota, members of the Sioux tribe of Standing Rock have been defying oil companies and authorities for several months. They want them to scrap a plan for a pipeline which they say crosses their sacred land. But now that Donald Trump has signed an executive order in favour of the plan, its proponents are pushing on. The demonstrators have been given until Wednesday to evacuate their protest camp. Our correspondent reports.
A programme prepared by Patrick Lovett, Josh Vardey and Florence Viala.