How Spain's migrant crisis created a political storm - whipped up by social media - BBC News

The Ceuta crossings have shaken Europe politically, exposing divisions over the sensitive issue of migration, the BBC's Sarah Rainsford writes.

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Watch: Migrants started to return to Morocco after thousands entered Spain's Ceuta on 30 July

Most of the tens of thousands of migrants who swam into the Spanish exclave of Ceuta on Thursday have now returned to Morocco, escorted to the border by Spanish soldiers and police.

But the extraordinary surge of arrivals has left at least 72 people dead, their bodies pulled from the sea where they floated alongside abandoned rubber rings and flippers.

This week's events have also shaken Europe politically, once again exposing divisions over the sensitive issue of migration.