Five children, one woman and four men drowned when their boat sank off the small Greek island of Farmakonisi, Greek coastguard officials said early on Wednesday. Another 13 people, 11 men and two women, were rescued and two were still missing according to witnesses, the officials said adding that a helicopter, a patrol boat and private vessels assisted the search-and-rescue operation. "The vessel, a 6-metre (20-foot) speed boat, sank under unknown circumstances," one of the officials told Reuters.