The surge of migrants across the Balkans on their way to Western Europe is continuing unabated in the hours after an EU-sponsored agreement to slow the flow.

European and Balkan leaders agreed early Monday on measures to stem the flow of tens of thousands whose flight from war and poverty has overwhelmed authorities and heightened tension among nations along the route.

Croatia's police said Monday morning more than 13,000 migrants arrived from Serbia in the past 24 hours. About 260,000 passed through Croatia since mid-September when Hungary put up a fence on the border with Serbia, diverting the flow.

Slovenia's police said Monday nearly 10,000 migrants entered Slovenia from Croatia in the same period, bringing the total number of arrivals in the past 12 days to almost 75,000.