The head of the European Union's border agency says there is "no burning crisis" right now in Europe due to migrant arrivals, but that more and more Africans are trying to enter Spain from Morocco.

Frontex chief Fabrice Leggeri said Wednesday that "right now we are not in the middle of a migration crisis at the external borders, but of course we do see that there is still a pressure."

Leggeri says unauthorized migrant crossings of the Mediterranean Sea dropped more than a quarter last year compared to 2017, to 150,000 arrivals.

He says the number of people leaving Libya and Tunisia on the central Mediterranean route for Europe plunged by 80 percent last year, to around 23,500 arrivals.