Authorities are detaining a 12th, previously undisclosed person implicated in the federal probe that busted a Cold War-style Russian spy ring, according to a U.S. official familiar with the matter.
Federal Bureau of Investigation counterintelligence investigators have been investigating the 23-year-old Russian man since last fall when his name surfaced in a decade-long espionage investigation, the official said.
Prosecutors in the Manhattan U.S. Attorney’s Office last month charged 11 people with being agents of Russia’s SVR foreign intelligence agency.
Ten in U.S. custody entered plea deals last Thursday as part of a diplomatic agreement to swap them for four people held by Russia, most on charges of spying for Western intelligence agencies.
It's unclear what drew investigators' interest in the 12th man, but FBI agents began monitoring him shortly after he entered the U.S. in October 2009, the official said.