Hungary's foreign minister says more than 100,000 migrants have reached the country so far this year, nearly all of them entering through its southern border with Serbia.

Foreign Minister Peter Szijjarto said Friday that both Hungary and Serbia are facing "unprecedented immigration pressure" and that more migrants are coming to the European Union on the land route across the Balkans than by crossing the Mediterranean Sea.

Szijjarto spoke after reopening a border crossing with his Serbian counterpart, Ivica Dadic, near the Hungarian village of Roszke and Horgos in Serbia.

Hungary says it will finish building a 4-meter (13-foot) fence on the border between the two countries by Aug. 31 to try to stem the flow of migrants.