Migrants arrive on the shores of the Greek island of Lesbos after crossing the Aegean Sea from Turkey on a dinghy on September 10, 2015. AFP

AFP/Istanbul

Turkish authorities have rounded up in the past four days nearly 3,000 migrants planning to cross the Aegean Sea to EU member Greece, local media said Friday.
The detentions were part of a major operation that was launched on Monday, a day after Turkey and the European Union reached a deal to stem the flow of refugees into Europe.  
The Turkish coastguard apprehended a total of 2,933 migrants, mainly from Syria and Iraq, as they were preparing to make their way to the Greek island of Lesbos from the northwestern town of Ayvacik in Canakkale province, Dogan news agency reported.  
Thirty-five suspected smugglers were also detained while hundreds of migrant boats were seized, it added.  
The migrants will be sent to a detention centre where some could face deportation, Dogan said, without giving details.
At a summit in Brussels, the European Union vowed to provide three billion euros ($3.2 billion) in cash as well as political concessions to Ankara in return for its cooperation in tackling Europe's worst migrant crisis since World War II.
Turkey hosts more than two million refugees from the Syrian conflict and is the main launching point for migrants coming to Europe, via Greece.
More than 886,000 migrants have arrived in Europe by sea so far this year, according to the latest UN figures.
Of those, nearly 600 people have died using the eastern Mediterranean route, according to the International Organization for Migration.