(RNN) – CNN is reporting that a federal grand jury in the nation’s capital on Friday approved charges in the investigation headed by special counsel Robert Mueller into alleged Russian meddling into the 2016 election.

A federal judge had ordered the charges to be sealed. Those charged were to be taken into custody as soon as Monday, CNN said, citing sources. The specific nature of the charges was not known.  

Former FBI chief Mueller was tapped in May to lead the probe. Deputy Attorney General Rod Rosenstein chose Mueller after Attorney General Jeff Sessions recused himself. 

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