A private yacht with three Russians and two Egyptians on board which had been reported missing in the Red Sea off Yemen turned up in Djibouti on Thursday after what the owner said was an attack by unknown gunmen.The 30 Minutes sent its last signal on Tuesday night off the coast of Jizan, a port in southern Saudi Arabia near the Yemeni border before appearing to go missing, owner Dmitriy Chuguevskiy had told Reuters,"According to the people on board ... they were going in international waters off Yemen. They were attacked from the Yemen side, shot at ...