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.
The president of the European Commission, Jean-Claude Juncker has offered Croatia technical and logistical assistance to help the country deal with the huge number of refugees crossing its border.
More than 17,000 refugees and migrants have entered the country since Hungary closed its borders on Wednesday morning
In a joint statement, Juncker and Croatian prime minister Zora Milanovic stressed the need to strengthen the EU's external borders, step up assistance to countries struggling to deal with the influx and agree a plan to share the burden between member states.
The statement was released ahead of an extraordinary summit on migration due to take place next Wednesday.
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.