  The CMS collaboration has recently reported a 2.8$\sigma$ excess of $eejj$
events with an invariant mass around 2 TeV. This observation can be explained
in the context of standard model extensions with new gauge bosons $W'$, $Z'$
and heavy neutrinos coupling (mainly) to the electron. We discuss additional
signals that allow to confirm or discard the $W'$ and $Z'$ hypotheses.
