indonesian authorities concluded that the crash had occurred for unknown reasons, resulting in nearly universal criticism that they had politicised the report so as not to strike fear into potential passengers of its fledgling national airline industry. an official investigation by the singapore police force found "no evidence that the pilot, copilot or any crew member had suicidal tendencies or a motive to deliberately cause the crash of [the aircraft]." u.s. authorities, whose painstaking research had become the main basis of criticism of indonesia's and singapore's findings, took a confidently different view. employing uncharacteristic brushes of rhetorical force and critical statements in their final report, they ruled the crash a suicide/homicide caused by the deliberate actions of silkair flight 185's captain tsu way ming. he deliberately murdered everyone aboard while committing suicide, according to the u.s.'s investigation.