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.
Workers were guarded by police on horse back as they put up the remaining section of a 109-mile razor wire fence protecting Hungary's border.
In recent months, refugees arriving in Hungary from Serbia have walked across the border on train tracks approaching Roszke, most hoping to continue their journey to Austria and other European countries.
People seeking asylum in Hungary or deeper in Europe must use a police-supervised road crossing from Tuesday, the Hungarian government said.
Anyone trying to get through the fence will face criminal charges and potential imprisonment or deportation back to Serbia.
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.