At least 33 migrants attempting to reach Greece have drowned after two boats got into difficulties off the Turkish coast.

Turkey's state-run Anadolu news agency said 22 died after a boat capsized in the Bay of Edremit, near the Greek island of Lesbos.

Earlier, the private Dogan news agency said the bodies of another 11 migrants had been found further south, near the Aegean resort of Dikili.

The International Organisation for Migration says 374 migrants have died so far this year while trying to reach Greece.

Earlier dozens of Greek riot police were deployed to a demonstration organised by the extreme right Golden Dawn party against plans to build a new transit camp for refugees and migrants near Athens.

Four of the party's 18 policymakers were at the rally outside the port of Perama, about 10 miles west of the capital, where the government is planning to build the camp with the help of the armed forces.

About 150 people staged a counter-demonstration near the site.

Greece is under pressure from the European Union to complete screening centres on five islands and increase its capacity to house asylum-seekers and detain migrants facing deportation.

Defence minister Panos Kammenos said the centres will be completed within a week.

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