Hungary's prime minister has said eastern European nations are forced to protect themselves from the "brutal threat" of mass migration until the EU organises a united response to the refugee crisis.
Prime Minister Viktor Orban's government has built a fence to keep out refugees on the Serbian border and is rapidly constructing a similar 3.5-metre-high steel fence on the Croatian border.
Thirteen migrants died in Turkish waters when a boat carrying 46 people en route to Greece collided with a dry cargo vessel and capsized, Reuters reports.
Six of those killed were children and 20 others were rescued, a Turkish coastguard source told the news agency.
The boat had left the Turkish coast near Canakkale province.
Seven of those rescued are receiving treatment and the search continues to find 13 missing people.
Earlier, in a separate incident 26 migrants were feared missing after a dinghy carrying them sank off the Greek island of Lesbos.
International development secretary announces extra resources to help identify and prioritise the most vulnerable refugees from camps.
Thousands of refugees and migrants have been trapped in a cruel tug-of-war overnight as European nations squabble over what to do with them.
Croatians have been warning refugees and migrants who are attempting to cross the country's border to be aware of minefields in the area.