Migrants flood Budapest rail station as police leave, but no trains running to Western Europe.

Supporters and activists of the Migration Aid civil group hold a demonstration in support of migrants at Kossuth Square, in front of the Hungarian Parliament building in Budapest, Hungary, Wednesday, Sept. 2, 2015. Over 150,000 migrants have reached Hungary this year, most coming through the southern border with Serbia. Many apply for asylum but quickly try to leave for richer EU countries. (Noemi Bruzak/MTI via AP) (The Associated Press)

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Migrants try to board a train at the railway station in Budapest, Hungary, Thursday, Sept. 3, 2015. Over 150,000 migrants have reached Hungary this year, most coming through the southern border with Serbia, and many apply for asylum but quickly try to leave for richer EU countries.(AP Photo/Frank Augstein) (The Associated Press)

A young child cries as hundreds of migrants try to board a train at the Keleti Railway Station in Budapest, Hungary, Thursday, Sept. 3, 2015. Over 150,000 migrants have reached Hungary this year, most coming through the southern border with Serbia. Many apply for asylum but quickly try to leave for richer EU countries. (AP Photo/Petr David Josek) (The Associated Press)

BUDAPEST, Hungary – Migrants have flooded in to Budapest's Police Keleti train station as police leave, but the train operator says that there will be no trains going to Western Europe.

The rail company says its stance was due to "railway transport" security reasons.

Police shut down the Keleti terminal to migrants on Tuesday, preventing those with valid tickets but no travel documents from boarding trains to Austria and Germany, many migrants' preferred destination.

There was no immediate explanation from police or other authorities about Thursday's decisions.

Hungarian Prime Minister Viktor Orban is meeting European Union leaders on Thursday in Brussels.