The names of those held has still not been made public, but last week Prince Miteb bin Abdullah, who was once seen as a contender to the throne, was released after agreeing an "acceptable settlement" with authorities of more than $1bn (£750m).
But Saudi authorities insist the purge was meant exclusively to target endemic corruption as the kingdom seeks to diversify its oil-dependent economy.
The nature of the charges also remains unclear but the attorney general's statement said "internationally applied procedures" had been followed.
Saudi forces also grounded private jets at airports, possibly to prevent high-profile figures from leaving the country, an aviation source said.
Saudi King Salman bin Abdul Aziz Al Saud Tuesday said that any United States move on Jerusalem is going to provoke Muslim feelings around the world. The government has not commented on his current status.
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