Guessing the issue was not engine failure since both engines went at the same time. That sounds like either a fuel issue (ran out) or a serious system failure.
Fuel occurred to me as well.
I cant think of any other issue except fuel. Nothing else in the AC that would cause both engines to shut down and not take out something else to make the plane un flyable..
maybe shorted it... its happened before..
Somebody who claims to have been at the airport says it was only a single engine failure.
I’ll bet she’s going to think twice about flying her private jet again...