As it is well known, some Saudi royalties have a large stake in Citi-Bank, the bank they bought at bargain prices when it nearly collapsed in the early 90-s. They are shaking in their sand tents right now as the value of the bank is falling and they found who to blame. The messenger.
It's not like they didn't see it coming.
Now - no one is saying who is issuing the death threats, but a certain "not so peaceful" culture might raise a biased suspicion.