Greek authorities said a small plastic boat carrying migrants from Turkey to Europe has sunk off an eastern Greek islet drowning at least 13, mostly children, AP reported. The coast guard says another 15 people have been rescued, while a search is underway to locate one missing person. The dead were identified as seven children, four men and two women. The accident occurred before dawn Wednesday off the small Aegean Sea island of Farmakonissi. The cause of the sinking was not immediately clear.