At least 79 people died and hundreds are reportedly missing after a boat with refugees and migrants capsized in Greece on Wednesday.
The boat was reportedly to have sailed from Libya's Tobruk area. Greece has launched extensive search and rescue operations.
So far, 104 people have been rescued following the night-time incident while four persons were hospitalised with symptoms of hypothermia.
According to the coast guard, there is uncertainty over the number of passengers still missing. Greece has deployed six coast guard vessels, a navy frigate, a military transport plane, an air force helicopter, and several private vessels in the search and rescue operations
The Greece government says this is one of Greece's biggest migrant tragedies, and has declared three days of mourning. The boat reportedly went down about 80 km (50 miles) south-west of Pylos after the coastguard said it had refused help.
The search continued early on Thursday for more survivors, with aircraft dropping flares to help search teams.