At this moment anyone who is not witness can tell you what happened in such a detail is a liar. What

I do know is, given what crown prince did domestically (arresting 11 corrupted Saudi princes, 4 ministers and hundreds of businessmen and officials, and allowing women to drive ) and intentionally (against Qatar backed Muslim brotherhood, support Israel and support Trump admin's stand on Iran), he made a lot of enemies who want to do anything to make him looked bad.