12 migrants killed as boat sinks off Greece
21 people rescued alive, says Greek coast guard
In a press release, the Hellenic Coast Guard said 21 people have so far been rescued alive, while three of them were being taken to a hospital.
The number of people on board still remains unknown, as well as their ages, gender and nationalities.
Six coast guard vessels, four nearby boats, one navy helicopter and two air force helicopters are assisting the rescue operation.