Interior Structure of a Charged Spinning Black Hole in   $(2+1)$-Dimensions
  The phenomenon of mass inflation is shown to occur for a rotating black hole. We demonstrate this feature in $(2+1)$ dimensions by extending the charged spinning BTZ black hole to Vaidya form. We find that the mass function diverges in a manner quantitatively similar to its static counterparts in $(3+1)$, $(2+1)$ and $(1+1)$ dimensions. 
J.S.F. Chan, K.C.K. Chan and R.B. Mann