I always thought there was at least one other person, because Snowden seemed to have access to things to which he shouldn’t have had access and shouldn’t have been able to steal.
WASHINGTON — The F.B.I. secretly arrested a National Security Agency contractor in recent weeks and is investigating whether he stole and disclosed highly classified computer codes developed to hack into the networks of foreign governments, according to several senior law enforcement and intelligence officials.
The theft raises the embarrassing prospect that for the second time in three years an insider has managed to steal highly damaging secret information from the N.S.A. In 2013, Edward J. Snowden, who was also a contractor for the agency, took a vast trove of documents that were later passed to journalists, exposing N.S.A. surveillance programs in the United States and abroad.
The information believed stolen by this contractor — who like Mr. Snowden worked for the consulting firm Booz Allen Hamilton, which is responsible for building and operating many of the agency’s most sensitive cyberoperations — appears to be different in nature from Mr. Snowden’s theft.