SecState Rex Tillerson has laid off a number of high-level staffers, effective immediately. Reading between the lines, I'd guess he suspects some of the sniping at former National Security Advisor Mike Flynn either originated there or was facilitated there.
Those let go are political appointees, not civil servants. He has every right, and in fact a duty, to replace them with his own appointments - people loyal to him, not to Clinton/Kerry. People in short who support the Trump-Tillerson agenda.
For more on this action, see a CBS News story and/or a New York Post story, depending on whether you'd like an anti- or pro- slant to the tale. Hat tip to Lucianne.com for the link.