ATHENS, Feb. 23 (Xinhua) -- A boat carrying refugees and migrants sank off Samos island in the Aegean Sea, and a rescue operation was underway, the Hellenic Coast Guard said on Thursday. Some of the 18 people who have been rescued said there were 22 people on board and four fell in the waters, according to a press release from the Coast Guard. The incident happened as a European Conference on Border Manag