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A number of Saudi officials, including two members of the royal family, have been sacked.
A royal decree said Saudi King Salman had relieved Prince Fahad bin Turki of his role as commander of joint forces in the Saudi-led coalition in Yemen.
His son, Abdulaziz bin Fahad, was also removed as a deputy governor.
The men, along with four other officials, face an investigation into “suspicious financial dealings” at the Ministry of Defence, the decree said.
Crown Prince Mohammed bin Salman, who is the king’s son and is considered Saudi Arabia’s de-facto ruler, has spearheaded a campaign against alleged corruption in the government.
However, critics say the high-profile arrests have been aimed at removing obstacles to the prince’s hold on power.
Crown Prince Mohammed bin Salman, 35, won international praise when he promised a series of economic and social reforms to the deeply-conservative country after coming to power in 2016.