WASHINGTON — A federal grand jury in Washington, D.C., approved Friday the initial charges stemming from the investigation led by special counsel Robert Mueller.

First reported by CNN, the charges remain sealed by a federal judge. What the charges are was unknown but individuals could be taken into custody as soon as Monday, the network said.

The Justice Department in May appointed former FBI Director Robert Mueller as a special counsel for the investigation into possible ties between the Trump campaign and Russian operatives. Deputy Attorney General Ron Rosenstein signed the order.