A while back, I came across this link that is a very detailed report about everything related to the fire (168 pages long).

What a terrible tragedy it was.

Details from website:

"The official investigation report contains a detailed account of this fire and its cause. As a result of the many inquiries into this tragedy, the
Clark County Fire Department has made the findings of their investigation available to the general public.

Please note that this report is considered public information and may be distributed or copied for non-commercial educational purposes.
Altering any part of the report is strictly prohibited."