Ecuadorean soldiers and police stormed a house in Guayaquil where four leftist guerrillas were holding the nation’s leading banker. The rebels and their prisoner died in gunfire during the assault. The kidnapers, members of Colombian and Ecuadorean factions, had held Nahim Isaias since Aug. 7. They demanded ransom, release of guerrillas arrested during the search for Isaias and safe passage from Ecuador. Isaias owned one of Ecuador’s biggest banks, Filanbanco, a national television station and textile factories. He was also said to have interests in several Miami banks. President Leon Febres Cordero, a personal friend of Isaias who had flown to Guayaquil to supervise the rescue efforts, said the kidnapers shot Isaias to death when the raid began.