Not sure how serious this is yet. Obvious now that it was pretty serious.
Update: I'm watching the live video on lasvegasnow.com and it looks pretty bad. Lots of black smoke that actually looks like it is coming from two places.
Updated: The fire is extremely bad. Multiple floors on the South side - that side of the building at the top are basically destroyed. Major destruction. Wow, this is really bad. Clark County Firefighters are incredibly brave - they are up on the roof working to put this out. I guess guests are being moved to MGM Grand Garden Arena. Nice.
Diablo's Cantina indeed. I hope no one was hurt.
One interesting point - on the South side there, there is no low rise building at the base of the hotel tower. Hopefully that is making it easier to get crews closer from the ground.
Hats off to the amazing work of the Clark County Fire Department in getting this thing under control so quickly - and it does seem to be pretty much under their control now, despite the few flames still burning. Now the question is what does this mean for the property - how bad is the damage?
Update: Thanks to Mike_Ch, some more photos of the aftermath: http://www.ratevegas.com/photo/most_recent