  Results are presented on event-by-event electric charge fluctuations in
central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed
fluctuations are close to those expected for a gas of pions correlated by
global charge conservation only. These fluctuations are considerably larger
than those calculated for an ideal gas of deconfined quarks and gluons. The
present measurements do not necessarily exclude reduced fluctuations from a
quark-gluon plasma because these might be masked by contributions from
resonance decays.
