BARANJSKO PETROVO SELO, CROATIA - SEPTEMBER 21:  Hungarian soldiers erect a fence at a border point between Croatia and Hungary where migrants are being  transported by bus through to Austria on September 21, 2105 in Baranjsko Petrovo Selo,Croatia. Thousands are migrants have being transported by bus and train on to Hungary and Austria as European leaders are set to push for a unified response to the migrant crisis.  (Photo by Jeff J Mitchell/Getty Images)