Gabriel, who is also economy minister, urged Europe to examine how it can “quickly help in an efficient way the countries of origins of these refugees”.
The fence four metres (13 feet) high being built in addition along its entire 175-kilometre (120-mile) border with Serbia is due to be completed by the end of October or early November, the government says.
The ministers also agreed to implement a network of refugee camps which would be set up initially in Italy and Greece – where most refugees enter through – and later would be expanded overseas, in Middle Eastern and African countries.