London, England (CNN) -- Human Rights Watch on Saturday urged the Iraqi and U.S. governments to launch investigations into reports of torture and detainee abuse after the WikiLeaks website published thousands of classified military documents detailing the war in Iraq.
The release includes evidence that Iraqi security forces tortured and killed prisoners, the group said. Human Rights Watch called on the Iraqi government to prosecute those responsible.
It also urged the U.S. government to look into whether its forces broke international law by transferring thousands of detainees to Iraqi custody despite what Human Rights Watch called "the clear risk of torture."
"These new disclosures show torture at the hands of Iraqi security forces is rampant and goes completely unpunished," said Joe Stork, deputy Middle East director at Human Rights Watch. "It's clear that U.S. authorities knew of systematic abuse by Iraqi troops, but they handed thousands of detainees over anyway."
Also Saturday, anti-war activists said at a news conference that the WikiLeaks release revealed that 15,000 more Iraqi civilians died during the conflict than previously thought.
Video: Iraq reacts to WikiLeaks Video: Activists cite higher death toll Video: WikiLeaks under fire Video: Protecting U.S. contacts
"We have seen that there are approximately 15,000 never previously documented or known cases of civilians who have been killed by violence in Iraq," WikiLeaks editor-in-chief Julian Assange said.
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