Spectators and reporters were removed from the military hearing on Monday for a part of the case dealing with still classified, yet widely published, information.
Pfc. Bradley Manning's computer activity was the focus on Monday, with the fourth day of testimony focusing on a forensic examination of his two workplace computers.
An investigator revealed that he found more than 10,000 diplomatic cables and other sensitive information on a computer used by Manning. He also said someone had been searching for information on WikiLeaks where the classified material surfaced.
The hearing determines whether Manning faces a court-martial.
The Associated Press contributed to this story.