Well, as can be seen from the images above, it would appear as if Chief Keef managed to have Atlanta group Migos jumped by some of his henchmen while they were at Stadium in D.C. Even worse, his connects seem to have also relieved Migos member Quavo of his QC chain.
As far as further confirmation, you can find that easily through a simple search on various social networks).
UPDATE: Fat Trel, weighs in below-
@FATTREL: WEN YU CUM 2 ANUVA NIGGA CITY….. CHECK IN