What's behind the Western Sahara dispute?

A neglected conflict is straining ties between Algeria and Spain. Trade and diplomatic links have been cut because of a dispute over the Western Sahara region. But what's behind the recent escalation? And can it be resolved? Join host Nick Clark. Guests: Sidi Omar - Polisario Front Representative at the United Nations. Yasmine Hasnaoui - North Africa affairs specialist. Riccardo Fabiani - Project Director for North Africa, International Crisis Group.