So grave is the fallout from the disappearance of Saudi journalist Jamal Khashoggi that King Salman has felt compelled to intervene, five sources with links to the Saudi royal family said.

On Oct. 11, the king dispatched his most trusted aide, Prince Khaled al-Faisal, governor of Mecca, to Istanbul to try to defuse the crisis.

World leaders were demanding an explanation and concern was growing in parts of the royal court that the king's son Crown Prince Mohammed bin Salman, to whom he has delegated vast powers, was struggling to contain the fallout, the sources said.