Impurity behaviour in JET internal transport barrier discharges with reversed shear has been investi-gated. Metallic impurities accumulate in cases with too strong peaking of the main ion density profile. The accu-mulation is due to inwardly directed drift velocities inside the ITB radius. The strength of the impurity peaking increases with the impurity charge and is low for the low-Z elements C and Ne. Transport calculations show that the observed behaviour is consistent with dominant neoclassical impurity transport inside the ITB. MHD events in the core flatten the radial profile of the metallic impurity.