Recently IceCube collaboration has reported first evidence for the astrophysical neutrinos .
Observation corresponds to the total astrophysical neutrino flux of the order of 3 \cdot 10 ^ { -8 } GeV cm ^ { -2 } s ^ { -1 } sr ^ { -1 } in a PeV energy range ( ( 1 ) ) .
Active Galactic Nuclei ( AGN ) are natural candidate sources for such neutrinos .
To model the neutrino creation in AGNs we study photopion production processes on the radiation field of the Shakura-Sunyaev accretion disks in the black hole vicinity .
We show that this model can explain detected neutrino flux and avoids , at the same time , existing constraints from the gamma-ray and cosmic ray observations .