"I am really troubled, as the director of Frontex and as a European citizen, that member states are now building fences within the European Union," Fabrice Leggeri said in an interview with the Austrian daily Kurier published on Thursday.
Greek police arrest 10 over forged papers for migrants
"That's why we must intensify our efforts on the external borders," said Leggeri, whose agency is demanding more border officers and powers.
Macedonia last week began erecting a metal fence to keep out migrants at the Greek border who were trying to get to western Europe. It was the latest in a series of such moves by countries along the main migratory corridor from Greece to Germany.
Austria said in October it would begin building a fence on either side of its busiest border crossing with Slovenia, which has begun erecting its own razor-wire fence along parts of its frontier with Croatia.
Austria to build 3.7-km metal fence on Slovenia border: government
Hungary's anti-immigrant government shut its border to arriving migrants in October, starting a trend that has put severe strain on the European Union's prized system of open borders.
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