The migrants are among thousands currently crossing Europe in an attempt to reach richer northern European countries where they can seek asylum.
After suddenly landing in the path of the biggest migration in Europe for decades, Croatia said on Friday it could no longer offer them refuge and would wave them onwards, challenging the EU to find a policy to receive them.
A record 473,887 refugees and migrants have crossed the Mediterranean to Europe so far this year, the International Organization for Migration said, most of them from countries at war such as Syria who are seeking a better, safer life.