HORGOS, Serbia — The U.N. refugee agency on Friday urged Serbia and Hungary to find a solution for the refugees camping in dire conditions at their border, hoping to enter the European Union despite border closures. Serbian government minister Aleksandar Vulin said authorities will try to persuade the refugees to move to nearby transit centers from where they could apply for entry into EU-member Hungary. The U.N. refugee agency also expressed concern Friday that refugees in Greece have been moved to several sites with “substandard conditions” after being evacuated from a makeshift border camp near Idomeni.