The Balkan trail taken by migrants was completely shut down yesterday, officials from several countries said, adding to pressure on the European Union to complete a deal with Turkey to stem the flow of people.

EU member Slovenia on Tuesday announced all migrants without a valid Schengen visa would be denied entry as of midnight, a decision that Serbia said, “practically closes the Balkan route." Neighboring Croatia also announced that it would refuse the transit of most refugees, as countless migrants still seek to make their way to central Europe.