[A migrant mops the floor inside a former terminal building at the old international airport, which is used as a shelter for over 3,500 refugees and migrants, in southern Athens, Monday, May 16, 2016. A United Nations envoy for human rights has criticized the European Union's response to the refugee crisis, for showing a "lack of vision," operating under legal ambiguity, and backing the detention of newly-arrived migrants - including children - in Greece. (AP Photo/Thanassis Stavrakis)]THE HAGUE, Netherlands (AP) — Smuggling networks cashing in on the huge flow of migrants into Europe had an estimated turnover last year of up to $6 billion, international law enforcement agencies said Tuesday.
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