Late Saturday, authorities in the Gulf powerhouse launched what they said was an anti-graft drive which netted dozens of high-profile businessmen and politicians.
Those detained included billionaire Prince Al-Waleed bin Talal and the head of the national guard, Prince Miteb bin Abdullah.
Powerful Crown Prince Mohammed bin Salman was behind the arrest orders after he became head of the Anti-Corruption Committee created earlier the same day.
"The middle-of-the-night simultaneous establishment of a new corruption body and mass arrests over corruption raise concerns that Saudi authorities detained people en masse and without outlining the basis of the detentions," said Sarah Leah Whitson, Middle East director at the New York-based HRW.
HRW said the mass arrest of princes, current and former government ministers and officials as well as prominent businessmen raises human rights concerns.
Saudi authorities should immediately reveal the legal and evidentiary basis for each person's detention and ensure that each can exercise due process rights, it said.
Riyadh has defended the arrests as legal, saying that the suspects had been subjected to extensive investigation.
The authorities also said they were freezing the bank accounts of the accused and promised they would be tried in a court of law.
The Ritz Carlton hotel in Riyadh is rumoured to be the site where many of those arrested are being held.
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