Carrying babies, moving through cornfields and down train tracks, hiking across dirt roads and crawling under spools of razor wire, record numbers of migrants are arriving in Hungary across its southern border with Serbia.

Police said they detained 3,241 migrants on Wednesday, over 700 more than a day earlier and the highest number so far. Many are from Syria and want to reach richer EU countries to make an asylum claim.

Omar, a university student from Daraa, Syria, going to Germany because it was "a good country to live in," said it was hard to leave home but "we want to complete our life, we can't live like that."

German Chancellor Angela Merkel is joining Western Balkan leaders at a summit Thursday in Vienna focusing on migration and anti-extremism.