  Fast radio bursts (FRBs) are radio transients lasting only about a few
milliseconds. They seem to occur at cosmological distances. We propose that
these events can be originated in the collapse of the magnetosphere of
Kerr-Newman black holes (KNBHs). We show that the closed orbits of charged
particles in the magnetosphere of these objects are unstable. After examining
the dependencies on the specific charge of the particle and the spin and charge
of the KNBH, we conclude that the resulting timescale and radiation mechanism
fit well with the extant observations of FRBs. Furthermore, we argue that the
merger of a KNBH binary is one of the plausible central engines for potential
gamma-ray or radio afterglow following a certain FRBs, and can also account for
gravitational wave (GW) events like GW 150914. Our model leads to predictions
that can be tested by combined multi-wavelength electromagnetic and GW
observations.
