Two children, four women and a man drowned when a boat carrying them overturned off the Greek island of Lesbos on Tuesday, the coast guard said, the deadliest incident this year involving migrants trying to reach Greece, Reuters reported. Another 57 people were rescued in the operation northeast of the port of Lesbos, the coast guard added. It did not provide further details on the incident or the nationality of the victims. Greece became one of the main gateways for refugees flowing into Europe in recent years.