
The mini summit, called by European Commission President Jean-Claude Juncker, groups the heads of 10 EU nations, including German Chancellor Angela Merkel, plus the leaders of Albania, Serbia and Macedonia.
Bulgaria, Romania and Serbia on Saturday warned they would not accept being turned into a "buffer zone" for the tens of thousands of arrivals streaming into Europe.
"If Germany and Austria and other countries close their borders ... we will be ready to also close our borders at that very same moment," Bulgarian Prime Minister Boyko Borisov said.
Over past months, non-EU member Serbia has been swamped by migrants on their way from Greece and Macedonia to northern Europe. ?AFP