Federal prosecutors in Miami are preparing to formally indict 94-year-old Raul Castro for his alleged role in the 1996 downing of two civilian aircraft.The incident occurred in international airspace and resulted in the deaths of four individuals when Cuban Air Force jets destroyed the planes.Audio evidence purportedly capturing Castro ordering the attack will be used to support the case announced by the DOJ and FBI.Analysts describe the legal action as a symbolic political maneuver aimed at pressuring the Cuban government during a severe economic crisis.