The announcement of the arrests was made over Al Arabiya, the Saudi-owned satellite network whose broadcasts are officially approved. Prince Alwaleed’s arrest is sure to send shock waves both through the kingdom and the world’s major financial centers.

He controls the investment firm Kingdom Holding and is one of the world’s richest men, owning or having owned major stakes in News Corp, Citigroup, Twitter and many other well-known companies. The prince also controls satellite television networks watched across the Arab world.

The sweeping campaign of arrests appears to be the latest move to consolidate the power of Crown Prince Mohammed bin Salman, the favorite son and top adviser of King Salman.