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.
Norway is ready to impose border controls if the country sees an upsurge in refugee numbers, the minister of justice and public security has said.
"We are assessing various measures. Increased border control is one of the things we are considering," Anders Anundsen told journalists.
"It depends on the numbers that arrive. If they were to increase significantly or we believe we don't have sufficient control of our entry points, then we'll have to impose border controls. That's something we're continuously considering."
Tens of thousands of refugees from Syria and other countries are travelling to the Nordic region to seek asylum, especially in neighbouring Sweden.
Norway had originally expected to receive 11,000 applications in 2015 but has now revised that to 16,000-20,000
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.