  The recent IceCube publication claims the observation of cosmic neutrinos
with energies down to $\sim 10$ TeV, reinforcing the growing evidence that the
neutrino flux in the 10-100 TeV range is unexpectedly large. Any conceivable
source of these neutrinos must also produce a $\gamma$-ray flux which degrades
in energy en route to the Earth and contributes to the extragalactic
$\gamma$-ray background measured by the Fermi satellite. In a quantitative
multimessenger analysis, featuring minimalistic assumptions, we find a $\geq
3\sigma$ tension in the data, reaching $\sim 5\sigma$ for cosmic neutrinos
extended down to $\sim 1$ TeV, interpreted as evidence for a population of
hidden cosmic-ray accelerators.
