A collision between a speedboat carrying migrants and a Greek coast guard patrol vessel off the eastern Aegean island of Chios late Tuesday has left at least 15 migrants dead, while a search and rescue operation involving patrol boats, a helicopter and divers was underway in the area, the coast guard says. The coast guard says 25 migrants were rescued and transported to a hospital on Chios, as were two coast guard officers who were injured in the incident. It is unclear how many people had been on the speedboat, and a search and rescue operation is underway for potentially missing passengers.