  We present a study of the dijet invariant mass spectrum in events with two
jets produced in association with a W boson in data corresponding to an
integrated luminosity of 4.3 fb^-1 collected with the D0 detector at sqrt{s}
=1.96 TeV. We find no evidence for anomalous resonant dijet production and
derive upper limits on the production cross section of an anomalous dijet
resonance recently reported by the CDF Collaboration, investigating the range
of dijet invariant mass from 110 to 170 GeV/c^2. The probability of the D0 data
being consistent with the presence of a dijet resonance with 4 pb production
cross section at 145 GeV/c^2 is 8x10^-6.
