Flow of Ukrainian refugees testing limits of central Europe's capacity

A Ukrainian family from Mykolaiv sit inside a tent to warm up after crossing the border from Ukraine to Poland, fleeing the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 20, 2022. REUTERS/Fabrizio Bensch TPX IMAGES OF THE DAY

PRAGUE/WARSAW (Reuters) - Officials in Central Europe voiced concern on Sunday that they were reaching capacity to comfortably house some of the nearly 3.5 million refugees who have fled Ukraine since Russia's invasion and are now camped in temporary accommodation.

Most of the Ukrainians have arrived at border points in Poland, Slovakia, Romania and Hungary, data compiled by the U.N. refugee agency shows, putting pressure on the European Union countries now attempting to shelter them.