A collision between a speedboat carrying migrants and a Greek coast guard patrol vessel off the eastern Aegean island of Chios has killed at least 15 people, the coast guard said late Tuesday, while a search and rescue operation involving patrol boats, a helicopter and divers was underway for potentially missing people. The bodies of 14 people — 11 men and three women — were recovered from the sea, the coast guard said, while another 25 migrants, including about 11 children, were rescued and transported to a hospital on Chios, as were two coast guard officers who were injured in the incident.