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Blazars radiate from relativistic plasma jets with bulk Lorentz factors{\Gamma} ~ 10, closely aligned along our line of sight. In a number of blazarsof the Flat Spectrum Radio Quasar type such as 3C 454.3 and 3C 279 gamma-rayflares have recently been detected with very high luminosity and little or nocounterparts in the optical and soft X-ray bands. They challenge the currentone-zone leptonic models of emissions from within the broad line region. Thelatter envisage the optical/X-ray emissions to be produced as synchrotronradiation by the same population of highly relativistic electrons in the jetthat would also yield the gamma rays by inverse Compton up-scattering ofsurrounding soft photons. To meet the challenge we present here a model basedon primary synchrotron photons emitted in the broad line region by a plasmoidmoving out with the jet and scattered back toward the incoming plasmoid by anouter plasma clump acting as a mirror. We consider both a scenario based on astatic mirror located outside the BLR, and an alternative provided by a movingmirror geometry. We show that mirroring phenomena can locally enhance thedensity and anisotropy with associated relativistic boosting of soft photonswithin the jet, so as to trigger bright inverse Compton gamma-ray transientsfrom nearly steady optical/X-ray synchrotron emissions. In this picture weinterpret the peculiarly asymmetric lightcurves of the recently detectedgamma-ray flares from 3C 279. Our scenario provides a promising start tounderstand the widening class of bright and transient gamma-ray activities inblazars.

An Emerging Class of Gamma-Ray Flares from Blazars: Beyond One-Zone Models