Three persons that arrived with Blue Star 1 ferry from Patmos island to Piraeus were placed in isolation as two of them were found positive with coronavirus. The other passengers of the ferry disembarked normally at Piraeus.
An investigation has been launched and depending on the result the necessary actions will be taken for the rest of the ferry's passengers. 
The prosecutor has been informed and is expecting the investigation's result to find out if the two infected knew they were positive or not.