Russia investigation seeks 1st charges, indictment announcement may come as soon as Monday, sources say

Robert Mueller's team sought charges against at least one unidentified person

Sources tell ABC News an indictment announcement and arrest could possibly come as early as Monday.

A spokesman for the special counsel's office declined to comment.

CNN first reported a federal grand jury approved charges brought by Special Counsel Robert Mueller’s team.

It's unclear at this point how significant this potential action might be.