A new Saudi anti-corruption body has detained 11 princes, four sitting ministers and dozens of former ministers, media reports say.
According to a New York Times report, one of those arrested is billionaire Alwaleed bin Talal.
The detentions came hours after the new committee, headed by Crown Prince Mohammed bin Salman, was formed by royal decree.
BBC security correspondent Frank Gardner says Prince Mohammed is moving to consolidate his growing power while spearheading a reform programme.
It is not clear what those detained are suspected of. However, Saudi broadcaster Al-Arabiya said fresh investigations had been launched into the 2009 Jeddah floods and the outbreak of the Mers virus which emerged in Saudi Arabia in 2012.
The new anti-corruption committee has the power to issue arrest warrants and travel bans, the state-owned Saudi Press Agency (SPA) reported.