On the third day of a pre-trial hearing yesterday, regarding five "high-value" detainees accused of involvement in the attacks, the court heard that the prisoners' possessions were the subject of regular searches.
Navy Commander George Massucco admitted under questioning that "several searches" carried out since February included monitoring of "privileged" correspondence between the five defendants and their lawyers.
Attorneys for the five men, who face the death penalty if they are eventually tried and convicted for the murders of nearly 3,000 people on September 11, 2001, have protested against the seizure of confidential documents marked as legal papers and their subsequent disappearance.
Cells were searched to maintain "the safety of the guardforce," Massucco said, stating that staples, paperclips, metal items and zip ties were the sorts of items officers searched for.
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The photo of the World Trade Center on flames was found in the possession of 9/11 mastermind Khalid Sheikh Mohammed, Massucco added under questioning from a prosecutor.
Arabic newspapers and 87 pages of articles from the website GitmoWatch had also been found in Mohammed's cell, he added.