Did they ever find the cause of the explosion at their plant this past June?

Someone asked Nosler a very similar question on July 19th on their Facebook page and they answered that the cause of the initial FIRE was never determined.
Obviously, the fire caused something to explode but not sure exactly what that something might have been.

My guess would be PETA or ELF, but I have no way to prove it.....

From what little I read ; An employee test firing in the south tunnel I believe sparked a trash fire

some debris boxes an such were piled up and went up . He was able to pull the Alarm and everyone was able to

exit safely . I don't know any more than what I read .