Suspicion about the leaks has fallen on one man: US Army Private Bradley manning. He is currently in military custody over the leaking of material from Iraq and Afghanistan.
Mr Manning has been held in solitary confinement for the last seven months and is facing a court martial in the New Year.
The former intelligence analyst is charged with unauthorised downloads of classified material while serving on an army base outside Baghdad.
The military suspects Manning, a former intelligence analyst, took state department archive as well as secret video footage and daily war logs from military operations in Afghanistan and Iraq.
It has been reported that Manning would go in with a music disc, for example Lady Gaga. He would then erase the music and then write a compressed file.
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To avoid suspicion, he would lip-sync the songs to make it look authentic.
