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The US Justice Department says authorities have arrested 10 suspects on charges of spying for Russia.
They claim court documents show they tried to penetrate decision-making circles of the Federal government.
So far the Russian Foreign Ministry and Foreign Intelligence Service have made no comments on the report.
The US says the suspects were all members of a Russian intelligence program that operates inside the United States. They were all arrested on Sunday.
They were allegedly carrying out long-term, "deep-cover" assignments in America on behalf of the Russian Federation. One suspect remains at large.
The 11 defendants are to be charged with two separate criminal complaints, with one count being conspiring to act as unlawful agents of the Russian Federation within the United States. This carries a maximum penalty of five years in prison.
Nine are also charged with the accusation of conspiracy to commit money laundering, which carries a maximum penalty of 20 years in prison.
Johnathan Kroll, Neighbor of Accused, said, "Just see them around the neighborhood, generally quiet, very little sort of attention drawn to them at all. The only thing that drew attention to them, as I said, the dogs barked pretty loudly at night, besides that they were kind of unassuming, no attention at all."
Tatinana, Neighbor of Accused, said, "Well, I would be surprised because I saw some Russians that lived across the street and I will think they were students. I will never think that they were spies."
The defendants were arrested in New York, New Jersey, Boston, and Arlington, Virginia. Charges were filed in the US District Court for the Southern District of New York.
A statement said the case is the result of a multi-year investigation.