Over the last 24 hours the Spanish territory of Ceuta has seen an unprecedented surge of migrant arrivals.
About 60,000 people from Morocco crossed the brief border into the enclave, a hotspot for those aiming to reach Europe.
Dozens died during the risky crossings.
Spain confirms that more than 48,000 migrants returned to Morocco voluntarily on Friday evening.
BBC journalist Sarah Rainsford outlines what triggered the surge and what could happen next.















