The Desert Locust outbreak in the Horn of Africa could provoke a humanitarian crisis warns the Food and Agriculture Organization of the United Nations (FAO). The locust invasion is the worst in decades to strike Kenya, Ethiopia and Somalia, and has destroyed hundreds of thousands of acres of crops. As swarms of the pest continue to migrate and devastate crops in its path, FAO is calling for urgent international support to fight the worsening upsurge. FAO senior locust forecasting officer Keith Cressman provides an update on the locust situation.