Washington (CNN) A federal grand jury in Washington on Friday approved the first charges in the investigation led by special counsel Robert Mueller, according to sources briefed on the matter.

The charges are still sealed under orders from a federal judge. Plans were prepared Friday for anyone charged to be taken into custody as soon as Monday, the sources said. It is unclear what the charges are.

A spokesman for the special counsel's office declined to comment. The White House also had no comment, a senior administration official said Saturday morning.

Mueller was appointed in May to lead the investigation into Russian meddling in the 2016 election.

Under the regulations governing special counsel investigations, Deputy Attorney General Rod Rosenstein, who has oversight over the Russia investigation, would have been made aware of any charges before they were taken before the grand jury for approval, according to people familiar with the matter.

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