Anti-terror measures worldwide have seriously undermined international human rights law, a report by legal experts says.
After a three-year global study, the International Commission of Jurists said many states used the public's fear of terrorism to introduce measures.
These included detention without trial, illegal disappearance and torture.
It also said that the UK and the US have "actively undermined" international law by their actions.
It concluded that many measures introduced to fight terrorism were illegal and counter-productive.
The panel of eminent lawyers and judges concluded that the framework of international law that existed before the 9/11 attacks on the US was robust and effective.
It's dangerous for countries to put reactionary anti-terror measures in place without considering their legal and ethical implications; the belief that their national security measures are outside the realm of international law is ignorant. The America's rash actions on this front in the past seven or so years have finally come to a close thanks to the arrival of the Obama administration, leaving us all to breathe a collective sigh of relief. However damage has been done and the United States and the countries that cooperated with such programs as 'extraordinary rendition' must do their best to reverse their actions. Sadly, however, justice will almost certainly evade the victims of the illegal post-9/11 anti-terror programs.