The EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) has
observed at energies above 100 MeV strong gamma-ray flares with short-term time
variability from the gamma-ray blazars 3C 279 and PKS 1622-297. During these
flaring periods both blazars have been detected by the COMPTEL experiment
aboard CGRO at photon energies of about 10 MeV, revealing simultaneous
gamma-ray activity down to these energies. For both cases the derived fluxes
exceed those measured in previous observations, and 3C 279 shows an indication
for time variability within the observational period. Both sources show
evidence for `hard' MeV spectra. In general the behaviour of both sources at
gamma-ray energies is found to be quite similar supporting the conclusion that
the underlying physical mechanism for both gamma-ray flares might be the same.
