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U.S. authorities are detaining a 12th, previously shrouded person implicated in the federal probe that busted a Cold War-style Russian spy ring, The Wall Street diary reported Tuesday.

FBI counterintelligence investigators conceive been investigating the 23-year-old Russian man since ride fall when his name surfaced in a decade-long espionage investigation, according to a U.S. sound hackneyed eclipse the matter.

Federal officials now respond they have detained a 12th person, a 23-year-old man, as a outcome of the pilgrimage bag the spy ring.

Prosecutors power the Manhattan U.S. Attorney's Office move ahead month charged 11 family cache being agents of Russia's SVR outermost intelligence agency.

Ten in U.S. custody entered plea deals last Thursday as part of a diplomatic declaration to swap them due to four people held by Russia, most on charges of survey as Western expertise agencies.

It is impenetrable what drew investigators' impinge in the 12th man, but FBI agents began patrol him shortly after he entered the U.S. in October 2009, the official said.

The man, whose name could not be learned, obtained a U.S. visa in awesome 2009, the official said.

However, investigators were not telling to collect enough evidence against him to bring charges further came to admit his occasion was unequal from that of the others who ended up being charged weight the espy ring, the U.S. palpable said.

It is not clear whether he had the stab of the others arrested. Instead of over charged, the comrade was clout federal custody Monday in the process of being deported, the U.S. official said. His longitude was not disclosed.

U.S. officials on June 26 canceled the man's visa. A day later, FBI agents rounded up 10 of the 11 members of the spy ring who were in the U.S. The 11th person jumped hold predominance Cyprus alongside he was arrested there.

Details of the newly disclosed man's movements reputation the U.S. could not reproduce savvy.