The Latest: Greek coast guard searches for migrant boat

BUDAPEST, Hungary – The Latest on the flow of migrants into Europe (all times local):

4:25 p.m.

Greece's coast guard has launched a search and rescue operation for a boat believed to be carrying dozens of migrants in the southern Aegean following an emergency call from a passenger.

Two patrol boats, a coast guard aircraft and nearby ships were participating in Monday's search between the southern islands of Kythira and Antikythira.

The operation was launched after a passenger called emergency services requesting help for the vessel, saying it was carrying about 40 people. The coast guard said communication was poor and the caller did not specify the type of vessel or what problem it was experiencing.

Greece was the main point of entry for migrants entering the European Union before an EU-Turkey deal limited new arrivals. Most heading from Turkey to Greece cross to islands in the eastern Aegean.

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1:20 p.m.

Hungary has begun building a second fence on its border with Serbia to stop migrants from freely entering the country, the government says.

The government spokesman's office confirmed a report published in pro-government newspaper Magyar Idok.

Hungary built a barrier along the length of its borders with Serbia and Croatia in 2015. The government says the second fence is needed because it expects a surge of migrants to reach its borders this year.

"Although the EU-Turkey agreement is prevailing and the Western Balkan route is closed, we expect the migration pressure to appear at any moment at our southern borders," Foreign Minister Peter Szijjarto said after meeting his Romanian counterpart, Teodor Melescanu. "For this reason, we are strengthening the defense of our southern border."