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NEW: U.N. official: "We don't know" the reason for the situation in Hungary, European leaders need to address it

Police in Hungary stop trains carrying Syrian refugee families outside Budapest

"The problem is a German problem," Hungarian Prime Minister Viktor Orban says

Bicske, Hungary CNN  — 

Chaotic scenes erupted Thursday as trains packed with Syrian refugees were halted at a station outside the Hungarian capital, Budapest, in the latest setback for desperate families seeking to reach Western Europe.

Police gathered at the side of the track as the trains abruptly stopped at Bicske.

A CNN crew on one of the trains said the families – who boarded hoping to travel to Austria or ultimately Germany – were refusing to get off despite suffocating heat and limited food and water.

Some youths and men were holding on to the handles of train cars in case police attempted to board and remove them forcibly. Meanwhile, parents fanned their crying children in an attempt to cool them down.

Tents and desks had been set up near the station in what the migrants feared was a relocation camp to transfer them to a nearby refugee center.

The trains had left Budapest, destination unknown, after the city’s main Keleti station – packed with weary migrants and refugees who’ve been waiting for days to travel onward to Western Europe – reopened in the morning.

Only domestic trains are leaving the station, Hungarian government spokesman Zoltan Kovacs told CNN earlier.

U.N. official: European leaders have explaining to do

In recent days, Keleti station has become a focal point of the crisis engulfing parts of Europe as an unprecedented wave of people – mostly refugees fleeing conflict in Syria, Iraq and Afghanistan – seek to reach Northern and Western Europe.

Most every European country has been affected in some way. And leaders and citizens around the continent, for the most part, have adopted positions that they hope will deal with the crisis.