  Searches for new physics in the single and paired dijet mass spectrum are
performed using data collected by the CMS experiment at the LHC at a collision
energy of sqrt{s}=7 or sqrt{s}=8 TeV. No evidence for new physics is found and
upper limits are set for various models. At 95% confidence level, a string
resonance in the single dijet spectrum is excluded for masses between 1 and 4.7
TeV and, for the first time, a coloron in the paired dijet spectrum is excluded
for masses between 250 and 740 GeV.
