The circumstances surrounding the accident are still under investigation, as the cause is not yet fully understood.

Translation language

Sentence

Narrator

Authorities are investigating the accident, as the cause remains unclear.

The details surrounding the incident are currently being examined; a definitive cause has yet to be determined.

They're still trying to figure out what happened in that accident.

The investigation into the circumstances of the accident is ongoing, pending a determination of liability.

An investigation is underway to ascertain the cause of the accident.

They haven't figured out yet what caused the accident.

We don't know what caused the accident yet.

Being examined or inquired into.

Completely comprehended or grasped.