Saudi Arabia tortured and sexually harassed human rights activists, including several women, human rights groups have alleged.
Prisoners in the kingdom's Dhahban Prison have allegedly been electrocuted and flogged.
Saudi Arabia arrested several women's rights activists earlier this year and influential clerics and intellectuals have also been detained.
The BBC has approached the Saudi authorities for comment.
However, a Saudi official told the Wall Street Journal the kingdom "does not condone, promote, or allow the use of torture".
Both Amnesty International and Human Rights Watch issued statements on Tuesday detailing alleged torture of detained prisoners.
Activists were left unable to walk or stand properly after electrocution and flogging, an Amnesty International release said, with one woman reportedly sexually harassed by interrogators in face masks.
Human Rights Watch's release also speaks of electrocution, as well as whipping and "forcible hugging and kissing" of at least three detained women. [BBC] Read more
