ATHENS, Greece (AFP) — At least 34 people, among them 15 babies and children, drowned when their overcrowded boat capsized in high winds off a Greek island on Sunday, the latest migrant tragedy at sea.

The latest deaths came as Athens angrily defended its handling of the mounting refugee crisis in Europe and appealed for more help.

Four babies and 11 young children — six boys and five girls — were among those on the stricken wooden boat when it sank off the island of Farmakonisi, Athens News Agency reported.

Eight of the victims were found by coastguard frogmen in the hold of the boat.

A total of 34 people were found dead, while another 68 were plucked alive from the sea and a further 29 managed to swim to safety on a beach on the island, according to latest coastguard figures.

The exact number of those aboard remains unknown but the ANA said it was overcrowded and went down because of high winds in the area.

The coastguard was also still searching for four children missing after another boat capsized on Saturday off Samos, a Greek island just off the Turkish coast.

The latest tragedies follow the death of a Syrian toddler whose lifeless body was photographed washed up on a Turkish beach last week, becoming a heartwrenching symbol of the plight of refugees fleeing war.

The International Organisation for Migration has said more than 430,000 migrants and refugees had crossed the Mediterranean to Europe so far in 2015, with 2,748 dying or going missing en route.