Faced with delays, hundreds of people are being forced to camp outdoors along the route that they hope ends in Austria, Germany and other European Union nations.
Several former Soviet bloc countries opposed the plan but were overruled by a majority. The number of refugees assigned was determined by the size and wealth of each country.
As domestic and international criticism mounts, Saudi Arabia and its peers are under pressure to review their policies toward migrants and refugees. They say they're already doing a lot to help.
Croatia has closed highways leading in from Serbia. And neighboring Hungary has started building a fence on its border with Croatia, in addition to two others along its borders.
After learning that the Syrian man who was tripped at the Hungarian border last week was a soccer coach, a Spanish official offered him a place to live and work.
Hundreds of people who were caught on the Serbian side of Hungary's border when the border was sealed Tuesday are sleeping out in the open; some are taking Croatia up on its offer of passage.
Hungary declared a crisis in two southern counties Tuesday, as crowds of refugees and other migrants were halted in Serbia, having missed Tuesday's deadline before new and stricter laws took effect.
Hours before a Tuesday deadline, Hungarian soldiers and police formed a human chain to prevent refugees from crossing, as they erected a fence along their southern border with Serbia.
Petra Laszlo, who was caught on video sticking her leg out as a man ran from police while clutching a child to his chest, says she is sorry — and not "heartless."