  The dynamics of topological domains which break parity (${\cal P}$) and
charge-parity (${\cal CP}$) symmetry of QCD are studied. We derive in a general
setting that those local domains will generate an axial current and quantify
the strength of the induced axial current. Our findings are verified in a
top-down holographic model. The relation between the real time dynamics of
those local domains and chiral magnetic effect is also elucidated. We finally
argue that such an induced axial current would be phenomenologically important
if topological domains are created in heavy-ion collisions experiment.
