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In the final filing before a second custody hearing in a week, prosecutors said Thursday afternoon that a former National Security Agency contractor accused of removing massive amounts of secret data and documents should remain in custody.

Among that trove of data, investigators say they found “numerous names of intelligence officers of the United States” who are serving abroad.

When Martin was arrested in August, investigators seized 50TB worth of data and many other printed and classified documents from Martin’s home in suburban Maryland. If all of this data was indeed classified, it would be the largest such heist from the NSA, far larger than what former contractor Edward Snowden took.