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We investigate the consequences of acceleration of nuclei in jets of activegalaxies not far from the surface of an accretion disk. The nuclei can beaccelerated in the re-connection regions in the jet and/or at the jet boundary,between the relativistic jet and its cocoon. It is shown that the relativisticnuclei can efficiently fragment onto specific nucleons in collisions with thedisk radiation. Neutrons, directed towards the accretion disk, take asignificant part of energy from the relativistic nuclei. These neutrons developa cascade in the dense accretion disk. We calculate the neutrino spectraproduced in such hadronic cascade within the accretion disk. We propose thatthe neutrinos produced in such scenario from the whole population ofsuper-massive black holes in active galaxies can explain the extragalacticneutrino background recently measured by the IceCube neutrino detector,provided that $5\%$ fraction of galaxies is AGN and a few percent of neutronsreach the accretion disk. It is predicted that the neutrino signals in thepresent neutrino detectors, produced in terms of such a model, are not expectedto be detectable even from the nearby radio galaxies similar to M87.

High energy neutrinos produced in the accretion disks by neutrons from nuclei disintegrated in the AGN jets