Migrant and refugee arrivals to Greece from Turkey rose sharply on Wednesday, just over a week after the European Union and Turkey struck an agreement intended to cut off the flow and as hundreds marched through central Athens to protest that deal.

The demonstrators included human rights activists, students and migrants from among the thousands stranded in Greece by recent border closures across the Balkans.

Greek authorities recorded 766 new arrivals between Tuesday morning and Wednesday morning, up from 192 the previous day. Most entered the country via the northeastern Aegean island of Lesbos.