The Latest on the flow of migrants into Europe (all times local):

12:25 p.m.

European Council President Donald Tusk is warning prospective economic migrants to not even think of setting off toward Europe.

Tusk says people who are looking for a better life but are not fleeing war should not risk their lives or their money paying smugglers to bring them to Europe.

"It is all for nothing," he said. "Greece, or any other European country, will no longer be a transit country."

Tusk was in Athens as part of a tour through countries worst affected by the continent's immigration crisis. Later Thursday, he was to visit Turkey, from where the vast majority of the roughly 1 million migrants who entered Greece over the past 14 months crossed over in smuggling boats.

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10:35 a.m.

A group of migrants at Greece's border with Macedonia have blocked a rail line in protest at Macedonia's refusal to let them in to continue their route toward Western Europe.

The group lay down on the Greek side of the train track Thursday morning, preventing a freight train that had just crossed from Macedonia from continuing its journey south.

Some 10,000 people are blocked at the border. Macedonian authorities have said they will only let in as many people as the next country on the route, Serbia, takes. Greek police said that in the 24 hours to 6 a.m. Thursday, 500 people were allowed to cross.

Some of those who were allowed into Macedonia were then sent back by authorities there because of problems with their papers.