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 code developed to hack into the networks of foreign governments, according to several senior law enforcement and intelligence officials.
Mr. Martin — 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
An administration official said the case had been handled secretively not in order “to keep this guy from becoming another N.S.A. martyr,” but because it was a continuing law enforcement case and the hope was that Mr. Martin would cooperate.
