The Latest: Hundreds of migrants approach Hungary's border from Serbia as tough laws begin

Migrants sit on the ground arrested by Hungarian police officers and soldiers after they tried to cross the border line between Serbia and Hungary in Roszke, southern Hungary, Tuesday, Sept. 15, 2015. Hungary deployed a boxcar bristling with razor wire to close a key border crossing and warned of a new era of swift deportations Monday as governments across Europe debated how to share the burden of housing hundreds of thousands seeking refuge — and whether the continent's hard-won policy of passport-free travel could survive the unrelenting flow of humanity. (AP Photo/Matthias Schrader) (The Associated Press)

Migrants enter Hungary at the "Horgos 2" border crossing, near Horgos, Serbia, Monday, Sept. 14, 2015. Migrants at Hungary's crowded border crossings with Austria and Serbia faced fear and uncertainty Monday, as several European Union countries beefed up border controls in a precedent that could gut the bloc's cherished principle of free movement among most of its nations. (AP Photo/Darko Vojinovic) (The Associated Press)

Migrants wait at the "Horgos 2" border crossing into the Hungary, near Horgos, Serbia, Monday, Sept. 14, 2015. Migrants at Hungary's crowded border crossings with Austria and Serbia faced fear and uncertainty Monday, as several European Union countries beefed up border controls in a precedent that could gut the bloc's cherished principle of free movement among most of its nations. (AP Photo/Darko Vojinovic) (The Associated Press)

The latest developments as European governments rush to cope with the huge number of people moving across Europe. All times local (CET):

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9:05 a.m.

Hundreds of migrants have spent a night in tents or out in the open on the Serbian side of the border with Hungary awaiting the opening of the crossing at Roszke, which was closed shortly after midnight.

Hundreds continue to arrive, though Serbian border guards say that the crossing into Hungary will no longer be open. Two official crossings will allow migrants to cross, but will only allow in those who have applied for asylum in Serbia. Those who have not will be returned to Serbia.

Serbian officials have said they will not accept migrants back from Hungary.