More than 3,000 immigrants from the Middle East have entered Denmark since Sunday, but they don't want to stay in the country — they're on their way to Sweden, according to NPR.

Hundreds marched miles on foot to Denmark Wednesday, chanting "Sweden, Sweden." Elsewhere near the Danish border, migrants refused to get off a train because they wanted to get to Sweden. By the laws of the European Union, refugees are supposed to seek asylum in the first country they get to.

Denmark, however, has made it clear it will not be lenient toward refugees. The country recently launched ads warning migrants that they will not receive certain benefits if they seek shelter in the country. Sweden, by contrast, has a much more relaxed policy.

"I haven't hidden the fact that I think there are too many asylum seekers coming to Denmark... That's exactly why we've tightened up, first of all, on benefits. And it's also why I've announced there will be more tightening-up down the road," said Danish Integration Minister Inger Stojberg, reported NPR.

A pro-refugee rally is scheduled in Copenhagen, Denmark, for Saturday. As of Thursday afternoon, more than 30,000 Facebook users are planning to attend.

Wednesday, Hungary recorded its highest-ever influx of refugees. More than 3,200 people entered the country from Serbia, a figure that some have said is an underestimate, according to the Guardian.

Austria has suspended its rail transit with Hungary for Thursday because its stations cannot reasonably handle the volume of arriving passengers. Hungary plans to tighten border security in coming weeks, and the country's army began military exercises Wednesday to train for these roles.

The U.S. will allow at least 10,000 Syrian refugees to come into the country in 2016, according to Yahoo News, and several countries in Europe have pledged to take in many more. Some 42,000 refugees are expected to enter Hungary by next week.