  The statistics of black holes and their masses strongly suggests that their
mass distribution has a cutoff towards lower masses near $3 \times 10^{6}$
M$_{\odot}$. This is consistent with a classical formation mechanism from the
agglomeration of the first massive stars in the universe. However, when the
masses of the stars approach $10^{6}$ M$_{\odot}$, the stars become unstable
and collapse, possibly forming the first generation of cosmological black
holes. Here we speculate that the claimed detection of an isotropic radio
background may constitute evidence of the formation of these first supermassive
black holes, since their data are compatible in spectrum and intensity with
synchrotron emission from the remnants. The model proposed fulfills all
observational conditions for the background, in terms of single-source
strength, number of sources, far-infrared and gamma-ray emission. The observed
high energy neutrino flux is consistent with our calculations in flux and
spectrum. The proposal described in this paper may also explain the early
formation and growth of massive bulge-less disk galaxies as derived from the
massive, gaseous shell formed during the explosion prior to the formation of a
supermassive black hole.
