Mr Hague said the UK would work with EU partners to impose sanctions on those responsible to help bring an end to the violence.
The report, Torture Archipelago: Arbitrary Arrests, Torture and Enforced Disappearances in Syria's Underground Prisons since March 2011, includes maps locating detention centres, video accounts from former detainees and sketches of torture techniques.
Almost all the former detainees interviewed by Human Rights Watch said they had been subjected to torture or witnessed the torture of others during their detention.
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The aid organisation has had its in-country operations suspended for two months while officials investigate abuse claims from 2011.
We're on the cusp of of some deep rooted cold air from Siberia.
It has been 15 years since the end of the DRC's civil war, but now the country appears to be slipping back towards the abyss.