BUDAPEST, Hungary (AP):

Tempers flared among the thousands trapped in a makeshift refugee camp in the heart of Budapest on Wednesday as Hungary played hardball with its unwelcome visitors for a second day, blocking train ticket-clutching migrants from travelling deeper into Europe.

The migrants, who have swamped every nook and cranny of public space outside the city's Keleti train station, threatened to walk the 105 miles (170 kilometers) to the Austrian border if police don't let them board trains to their desired destinations in Austria and Germany.

Hungary tantalisingly opened the way Monday, allowing more than 1,000 migrants to pack westbound trains - and inspiring a migrant surge to the capital - before it withdrew the option 24 hours later. The question of how to defuse the human gridlock in Hungary is set to dominate meetings in Brussels on Thursday between EU leaders and Hungary's anti-immigrant prime minister, Viktor Orban.

Hungary, which for months had permitted most applicants to head west after short bureaucratic delays, now says it won't let more groups deeper into the European Union and has cited EU backing for the move. Police blocking migrants from entering the capital's main international train hub also stopped them from marching around the station, sparking scenes of anger but no violence.