Flow of Ukrainian refugees tests central Europe's limits

STORY: European officials on Sunday said their countries were running out of room to comfortably house some of the nearly 3.5 million refugees who have fled Ukraine since Russia’s invasion.

Most have arrived at border points in Poland, Slovakia, Romania and Hungary, according to data compiled by the U.N. refugee agency, putting pressure on the EU countries trying to shelter them.

At Poland’s busiest crossing, Jorge Galindo, a communications officer for the International Organization for Migration, said there are reports that another surge of refugees may be coming.

"We don’t know how many people and we don’t know when they will arrive. What we can say for sure is that after three weeks since the start of the war we continue seeing flows on a daily basis, over 10,000 every day just at this border crossing alone, Medyka.”

More than 2 million Ukrainians have fled to Poland. In the capital of Warsaw, refugees waited in line for a third day in front of the National Stadium, which has been temporarily turned into an administrative office to register new arrivals.

Natalia Strelcova arrived in Poland from an area near the Ukrainian city of Dnipro.

"Rockets started to fly and residents saw it. It’s difficult, it becomes scary, panic starts, and you want to run away somewhere. It’s harder because of children, we were worried that something would happen to them.”

Ukraine's Deputy Prime Minister said seven humanitarian corridors would open on Sunday to enable civilians to leave frontline areas.