They are being taken to reception centres near Zagreb.
Meanwhile, Hungary's claim that Europe's refugee policy has failed has been criticised by the EU's migration commissioner.
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Dimitris Avramopoulos says the barriers they've erected on the border with Serbia only divert migrants to other countries and escalate tensions.
“These are also difficult times for your neighbours – today's challenges are shared across Europe” he said.
“Passing on the refugee problem from one country to another is not a solution” he added.