Hundreds of migrants arrive by boat at Greek islands in 1 day, part of spring migrant surge

Rescued migrants stand on a deck of the Swedish Coast Guard ship KBV 001 Poseidon prior to being disembarked at the Messina harbor, Italy, Tuesday, June 9, 2015. Over the last weekend, nearly 6,000 migrants were rescued by an array of European military vessels, including 2,371 who were saved on Sunday from 15 boats that ran into difficulty shortly after smugglers set off with them from Libyan shores, the Italian coast guard said. (AP Photo/Carmelo Imbesi) (The Associated Press)

A rescued migrant waits to disembark from the Irish Navy ship Le Eithne at the Taranto harbor, Italy, Monday, June 8, 2015. Heartened by recent election successes by an anti-immigrant party, Italian politicians based in the north vowed Sunday not to shelter any more migrants saved at sea, even as thousands more were being rescued in the Mediterranean from smugglers' boats in distress. (AP Photo/Gaetano Lo Porto) (The Associated Press)

An Italian police officer stands next rescued migrants after they disembarked from the Swedish Coast Guard ship KBV 001 Poseidon at Messina harbor Italy, Tuesday, June 9, 2015. Over the last weekend, nearly 6,000 migrants were rescued by an array of European military vessels, including 2,371 who were saved on Sunday from 15 boats that ran into difficulty shortly after smugglers set off with them from Libyan shores, the Italian coast guard said. (AP Photo/Carmelo Imbesi) (The Associated Press)

Greek authorities say hundreds of people using small boats and dinghies have arrived over the past day on eastern Aegean islands near the Turkish coast, part of a surge of tens of thousands of migrants landing on Greek shores in recent months.

The coast guard said 457 people had been rescued from the sea in 12 separate cases off the islands of Lesbos, Chios, Kalymnos and Kos in 24 hours from Monday morning. Another 304 people had made their way ashore Monday to Lesbos' main port of Mytilene.

The U.N. refugee agency, UNHCR, said Greece had seen 48,000 refugee and migrant arrivals so far this year, the second-largest number in a European Union nation after Italy, where 54,000 people have crossed the Mediterranean Sea.