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The focus has been on who has ordered the killing. I do not have evidence regarding who has ordered the killing. What I do have is evidence suggesting that the responsibilities of high level officials may be engaged and therefore, is requiring further investigation. In particular, of the crown prince for a variety of reasons. The first one is that the people directly implicated in the murder reported to him.
Preceding the investigation into the execution of Mr Khashoggi a number of other human rights violations have been documented and have been denounced. There is no way the leaders of that state, including the crown prince, were not aware of those violations. In fact, there is evidence, credible evidence, pointing to their involvement.
Even the evidence warranting international investigation, criminal investigation into the responsibility of the crown prince, it is a logical step for me to be asking for him to be included in the sanctions until and unless there is evidence provided that he was not involved, didn't know, should not have known of the execution.