No migrants are known to have died in the Aegean Sea since late March, when a deal between Turkey and the European Union aimed at curbing migration movements began to take effect, an EU official said Thursday, dpa reported. The agreement seeks to put an end to a migration influx that saw more than 1 million people reach Europe last year. Most of them came via Turkey to Greece, undertaking dangerous sea journeys that not all survived. Under the agreement, migrants and asylum seekers reaching the Greek islands as of March 20 can be returned to Turkey. Since then, there has been a dramatic reduction in the number of people arriving in Greece, according Maarten Verwey, who has been appointed by the European Commission to oversee the implementation of the deal.