TEHRAN, Young Journalists Club (YJC) - Sheikh Saud al-Mojeb said he has completed inquiries into 381 high-profile corruption suspects and decided to keep 56 in custody and free the rest.
Those released include individuals proven not guilty but also others who had agreed financial settlements with the government after admitting corruption charges, he said.
Total settlements with the suspects had topped 400 billion riyals ($107 billion) in various forms of assets handed over that included property, securities and cash.
In November, the authorities launched an unprecedented anti-graft swoop that netted hundreds of members of the extended royal family, top businessmen and officials.
The anti-corruption drive was led by Mohammed bin Salman, the 32-year-old crown prince and author of the "Vision 2030" program of social and economic reforms in the ultra-conservative Muslim (Persian) Gulf nation.
Among those detained was one of the desert kingdom's most high-profile and wealthiest men, Prince Al-Waleed bin Talal.
The man dubbed the Warren Buffett of Saudi Arabia was released on Saturday after striking an undisclosed financial agreement with the authorities.
He remains chairman of the Kingdom Holding Company in which he owns a 95-percent stake.
Some critics have labeled Prince Mohammed's campaign a shakedown and power grab, but authorities insist the purge targeted endemic corruption as the country prepares for a post-oil era.
"The total number of subpoenaed individuals reached 381, a significant number of whom were called to testify or provide evidence," the attorney general said on Tuesday in a statement released by the information ministry.