In Picture: A look at Europe's Migrant Crisis
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1
President Donald Trump and first lady Melania Trump stand for a moment of silence to mark the anniversary of the Sept. 11 terrorist attacks, on the South Lawn of the White House in Washington, Sept. 11, 2017.

2
Migrants on the shores of the Greek island of Lesbos after crossing the Aegean sea from Turkey. More than 260,000 asylum-seekers have arrived in Greece so far this year, most reaching the country's eastern islands on flimsy rafts or boats from the nearby Turkish coast.

3
An excavator works on a huge pile of life vests and dinghies that have been used by migrants at a local dump of the island of Lesbos, Sept. 24, 2015.

4
Migrants look out of the window a train at the railway station in Zakany, near the Croatian border, 230 kms southwest of Budapest, Hungary, after they were transported to the Hungarian border by Croatian authorities.