Turkish authorities have rounded up some 1,300 migrants allegedly bound for Greece, Turkish state media report.
Police detained hundreds of migrants near the western town of Ayvacik, a main crossing point to Greece, according to the Anadolu news agency.
Among those detained were Syrian, Iraqi, Iranian and Afghan migrants as well as some suspected smugglers.
The move comes hours after Turkey and European leaders struck a deal to control the flow of migrants to Europe.
The detainees were sent to a repatriation centre where some could face deportation.
Campaign group Amnesty International said in a statement the move is "illegal as it is unconscionable".
"In the wake of this weekend's EU-Turkey migration talks, it's a stain on the EU's conscience too," said Andrew Gardner, Amnesty's Turkey researcher.
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