Hungary has begun building a fence on the country's southern border with Serbia meant to stem the unprecedented flow of migrants. State news wire MTI says work on the fence started Monday morning on the outskirts of the town of Morahalom. Minister of Foreign Affairs and Trade Peter Szijjarto had said earlier the 4-meter high fence would be built in the eight to 10 areas "most exposed to the immigration pressure." Around 80,000 migrants and refugees have reached Hungary already this year.