  We study to which extent SUSY extensions of the Standard Model can describe
the excess of events of 3.0 standard deviations observed by ATLAS in the on-Z
signal region, respecting constraints by CMS on similar signal channels as well
as constraints from searches for jets and E^{miss}_T. GMSB-like scenarios are
typically in conflict with these constraints, and do not reproduce well the
shape of the E^{miss}_T distribution of the data. An alternative scenario with
two massive neutralinos can improve fits to the total number of events as well
as to the H_T and E^{miss}_T distributions. Such a scenario can be realised
within the NMSSM.
