Under Investigation
No cause has been established yet. Anything published before the final report is provisional, including the widely repeated early theories.
Investigations of a major accident routinely take one to three years. Until the final report, the only authoritative material is what the investigating authority has itself published, usually a preliminary report of factual information with no analysis.
The archive marks these cases explicitly and attributes every claim, because the gap between the accident and the report is where speculation does the most damage.
Related terms
The investigation is open and nothing conclusive has been published. Expect a final report in one to three years, sometimes longer.
A preliminary or interim publication. It states facts established so far and normally contains no conclusion about cause.
The authority's formal statement of what caused the accident. The exact wording matters, and the archive quotes it rather than paraphrasing it.