The Cuban government says its troops exchanged gunfire with a Florida-registered speedboat of armed Cuban expatriates, killing four people and wounding six. Cuban officials say the boat neared the island and opened fire first. They say Cuban soldiers shot back, and later found guns, explosives, and combat gear on board.  Relatives in Miami say one man killed, Michel Ortega Casanova, lives in the U.S. and often dreamed of toppling Cuba’s government. Secretary of State Marco Rubio questions Cuba’s account and says the U.S. will gather its own facts.