That's according to the pro-independence Polisario Front.
It says Moroccan troops have launched an attack in the region.
Morocco's military says it has only set-up a "security cordon" after elements of the Polisario front blocked traffic on the only road linking it Mauritania and the rest of Africa.
So, could this be the end of the ceasefire in Western Sahara?
Presenter: Bernard Smith
Sidi Omar, Representative of the Frente POLISARIO at the United Nations in New York
Yasmine Hasnaoui, North Africa Specialist and Board member of the Institute of Saharan Studies Al Andalous
Riccardo Fabiani, Project Director covering North Africa at the International Crisis Group.
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