Crown Prince Salman (son of King Salman) was "staying" in Mandalay's top floors (which they own). A rival Saudi strike team was set up to take him out. But instead of being where they expected him, he was next door at the Tropicana playing. When the Saudi strike team realized the gig was up they had to shoot their way out. When the shooting started. An extrication team (FBI/CIA?) escorted Prince Salman out of the Holiday to safety and a helicopter. It was all an attempt of the next King's life gone bad, since he wasn't where he was supposed to be.
Cue up to events in Saudi Arabia since the shooting. Where King Salman is taking out his house rivals. Payback.
It's basically Game of Thrones (or rather the House of Plantagenet rivalry from the war of the roses, which Game of Thrones is loosely based on).
A little more recent context from July 2017 in this article (sorry it is NYT)Saudi King’s Son Plotted Effort to Oust His Rival
FBI/CIA is keeping the wraps on it. Not sure how it played out with them exactly but either way it looks bad for the FBI. It is likely they were monitoring the plot with paddock as their "asset" who was interacting with the Saudi assassination team. When things go south he is taken out by the strike team and they shoot their way out.
When I was in police training way back in the day, one exercise they had us do was look at suicide and murder scene pics and try to guess if it was staged or not (murder to look like a suicide). Sometimes you would just get a gut instinct. We didn't guess them all right but that gut instinct was correct more often than not. Paddocks death scene which is about the only thing the FBI has let out about the case looks like those old staged scenes. I doubt he died by his own hand.
- - - FBI/CIA is keeping the wraps on it. - - -
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Someone pointed out that one of the slimy highup FBI characters who are being exposed, is responsible for this
Vegas thing, IIRC McCabe.