At least 15 people were rescued by Turkish authorities from the Aegean Sea
A boat carrying migrants from Turkey to Greece has sunk with the loss of 25 lives, Turkey's coast guard says.
Fifteen people were rescued after the boat capsized near the Turkish resort of Didim.Reports suggest Macedonia has set new curbs on Syrian migrants trying to cross the land border from Greece.
Nato is expanding its mission in the Aegean to send patrols to Turkish and Greek territorial waters in the battle to defeat people smugglers.
Secretary General Jens Stoltenberg said in a statement: "The purpose of Nato's deployment is not to stop or push back migrant boats, but to help our allies Greece and Turkey, as well as the European Union, in their efforts to tackle human trafficking and the criminal networks that are fuelling this crisis."
An emergency summit will take place between the EU and Turkey on Monday to try to seek a common approach to handling the flow of arrivals.
A Turkish search and rescue operation was launched after the latest sinking in the Aegean Sea.
At least three children are believed to be among those who died.
The International Organization for Migration (IOM) says at least 321 migrants drowned trying to get to Greece between 1 January and 3 March.
