Dozens feared dead as migrant boat sinks off the coast of Greece

Officials say navy and air force efforts to rescue up to 50 people has shown no signs of progress

Dozens of people are feared to have died off the coast of Greece after their boat sank while attempting to make the perilous crossing from Turkey.

Efforts by Greece's navy and air force to rescue up to 50 people who went down with the vessel in stormy waters off Rhodes had shown no signs of progress by late Wednesday, coast guard officials said.