There are growing signs of a potentially destabilising rift between the king of Saudi Arabia and his heir, the Guardian has been told. King Salman bin Abdulaziz Al Saud and Crown Prince Mohammed bin Salman are understood to have disagreed over a number of important policy issues in recent weeks, including the war in Yemen. The unease is said to have been building since the murder in Turkey of the dissident Saudi journalist Jamal Khashoggi, which the CIA has reportedly concluded was ordered by Prince Mohammed. However, these tensions increased dramatically in late February when the king, 83, visited Egypt...