Tens of thousands of migrants crossed into Spanish territory from Morocco this week

Many of the migrants have now returned. Spanish authorities reported that at least 57 died, among them those who drowned as they attempted to swim to Ceuta, a Spanish autonomous city. Transcript JUANA SUMMERS, HOST: In Spain, authorities are reporting at least 57 people died, most of them drowned, as thousands of people attempted to cross into Spanish territory from Morocco. NPR's Miguel Macias has been following this, and he joins us now from Seville, Spain. Hi.MIGUEL MACIAS, BYLINE: Hi there.SUMMERS: So, Miguel, tell us - what exactly happened on the border with Morocco?MACIAS: Yes. This started a few days ago, but on Thursday, it reached a tipping point. It was kind of a free for all. Some migrants were swimming to get into Spain around the breakwater that separates the countries. But at some point, crowds were just walking in, law enforcement in Spain completely overwhelmed. Authorities say that a total of 50,000 people crossed the border.SUMMERS: And migration is obviously just a huge political issue. What's the reaction been like?MACIAS: Well, today, Prime Minister Pedro Sanchez had to fly to Ceuta, the Spanish territory near Morocco where the migrants were entering, to addre...