The overnight decision was exactly the domino effect that both asylum-seekers and European nations had feared would happen given the record number of people fleeing to Europe this year and new fears after the deadly Paris attacks of possible militants coming in with refugees.
Macedonia was not allowing in from Greece people from Morocco, Sri Lanka, Sudan, Liberia, Congo or Pakistan, the UNHCR spokeswoman in Serbia, Melita Sunjic, said today.
Slovenia, the next country in the chain, also said it has been turning back the so-called economic migrants.
Serbia has turned back to Macedonia some 200 migrants and Macedonia has not let them in, Sunjic said.
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"So they are stuck on a no man's land," she told The Associated Press.
Croatia refused 162 migrants from Morocco rejected by Slovenia. Slovenia later today said it will allow those migrants to proceed toward Austria.
In the Greek border area of Idomeni, police said the border has essentially been shut down to all since about 8 am after roughly 300 people, mostly from Iran, gathered at the crossing seeking to also be allowed through.
A further 2,500 people are waiting at a camp nearby that provides temporary shelter for those heading north through the Balkans.
Serbian Labor Minister Aleksandar Vulin today blamed EU-members Slovenia and Croatia for the ban, saying they have started turning back economic migrants those fleeing poverty, not war.
"We have to protect our country. That is why we have applied reciprocal measures toward the people Slovenia and Croatia have no room for," Vulin said.