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Federal prosecutors are backtracking on their allegation that a Russian woman accused of working as a secret agent offered to trade sex for access, according to a Justice Department court filing.

Prosecutors had earlier accused Maria Butina, a gun rights activist in U.S. custody on charges she worked as a covert agent and tried to establish back-channel lines of communication to the Kremlin, of offering to exchange sex for a position with a special interest organization.

But in a new court filing late Friday, prosecutors said they misinterpreted the messages. They said "even granting that the government's understanding of this particular text conversation was mistaken," there is other evidence to support keeping Butina in custody as the case against her moves forward in Washington.