WASHINGTON — The F.B.I. secretly arrested a former National Security Agency contractor in August and, according to law enforcement officials, is investigating whether he stole and disclosed highly classified computer code developed by the agency to hack into the networks of foreign governments.
The arrest raises the embarrassing prospect that for the second time in three years, a contractor for the consulting company Booz Allen Hamilton managed to steal highly damaging secret information while working for the N.S.A. In 2013, Edward J. Snowden, who was also a Booz Allen contractor, took a vast trove of documents from the agency that were later passed to journalists, exposing surveillance programs in the United States and abroad.
The contractor was identified as Harold T. Martin III of Glen Burnie, Md., according to a criminal complaint filed in late August and unsealed Wednesday. Mr. Martin, who at the time of his arrest was working as a contractor for the Defense Department after leaving the N.S.A., was charged with theft of government property and the unauthorized removal or retention of classified documents.
Mr. Martin, 51, was arrested during an F.B.I. raid on his home on Aug. 27. A neighbor, Murray Bennett, said in a telephone interview on Wednesday that two dozen F.B.I. agents wearing military-style uniforms and armed with long guns stormed the house, and later escorted Mr. Martin out in handcuffs.
According to court documents, the F.B.I. discovered thousands of pages of documents and dozens of computers or other electronic devices at his home and in his car, a large amount of it classified. The digital media contained “many terabytes of information,” according to the documents. They also discovered classified documents that had been posted online, including computer code, officials said. Some of the documents were produced in 2014.
But more than a month later, the authorities cannot say with certainty whether Mr. Martin leaked the information, passed them on to a third party or whether he simply downloaded them.
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