  Active galactic nuclei with misaligned jets have been recently established as
a class of high-energy gamma-ray sources. M87, a nearby representative of this
class, shows fast TeV variability on timescales less than one day. We present
calculations performed in the framework of the scenario in which gamma-ray
flares in non-blazar active galactic nuclei are produced by a red giant or a
gas cloud interacting with the jet. We show that both the light curve and
energy spectrum of the spectacular April 2010 flare can be reproduced by this
model, assuming that a relatively massive cloud of approx 1.e29 g penetrates
into the jet at few tens of Schwarzschild radii from the super-massive black
hole.
