Security has been stepped up at U.S. facilities around the globe ahead of the release of a Senate report on CIA secret interrogations.
The White House said on December 8 that embassies and other sites were taking precautions amid "some indications" of "greater risk."
The report, to be released on December 9, is expected to give details of the CIA’s interrogation of suspected Al-Qaeda operatives at secret facilities in Europe and Asia in the years after the September 11, 2001 terrorist attacks against the United States.
It is also expected to say harsh interrogations failed to deliver appropriate results.
President Barack Obama halted the CIA interrogation program when he took office in 2009, and has acknowledged that the methods used to question Al-Qaeda prisoners amounted to torture.