  The nearby active galaxy IC 310 (z=0.019), located in the Perseus cluster of
galaxies is a bright and variable multi-wavelength emitter from the radio
regime up to very high gamma-ray energies above 100 GeV. Very recently, a
blazar-like compact radio jet has been found by parsec-scale VLBI imaging.
Along with the unusually flat gamma-ray spectrum and variable high-energy
emission, this suggests that IC 310 is the closest known blazar and therefore a
key object for AGN research. As part of an intense observing program at TeV
energies with the MAGIC telescopes, an exceptionally bright flare of IC 310 was
detected in November 2012 reaching a flux level of up to >0.5 Crab units above
300 GeV. We have organized a multi-wavelength follow-up program, including the
VLBA, Effelsberg 100 m, KVA, Swift, INTEGRAL, Fermi/LAT, and the MAGIC
telescopes. We present preliminary results from the multi-wavelength follow-up
program with the focus on the response of the jet to this exceptional gamma-ray
flare.
