Security has been stepped up at US facilities around the world ahead of the release of a report expected to reveal details of harsh CIA interrogations, the White House says, the BBC reports.
Embassies and other sites were taking precautions amid “some indications” of “greater risk”, a spokesman said.
A 480-page summary of the Senate report is due to be released on Tuesday.
It is expected to detail the CIA’s campaign against al-Qaeda in the aftermath of 9/11.
As well as detailing the controversial methods used by CIA operatives in an effort to extract information from high-value suspects, the report is expected to say harsh interrogations failed to deliver appropriate results.
Publication of the report has been delayed amid disagreements in Washington over what should be made public.