  The completed IceCube Observatory, the first km^3 neutrino telescope, is
already providing the most stringent limits on the flux of high energy cosmic
neutrinos from point-like and diffuse galactic and extra-galactic sources. The
non-detection of extra-terrestrial neutrinos has important consequences on the
origin of the cosmic rays. Here the current status of astrophysical neutrino
searches, and of the observation of a persistent cosmic ray anisotropy above
100 TeV, are reviewed.
