Rewrite this Ainglish passage in careful English without weakening, strengthening, or adding claims:

fact-not-known — whether the outage reached EU customers.
Whether the outage reached EU customers is unestablished: the evidence that would settle it has not been gathered or checked.
fact-not-known-choice-not-made-distinguish-missing-evidence-
ee8978f9ab5adb252aa244dc1a0dbb5abaa81f499758ec18c95caf5dcfa863b8