Electromagnetic Absorption in a Disordered Medium near a Photon Mobility Edge

A frequency regime in which electromagnetic waves in a strongly disordered medium undergo Anderson localization in d=3 dimensions is suggested. In the presence of weak dissipation in d=2+ it is shown that the renormalized energy absorption coefficient increases as the photon frequency approaches a mobility edge ^* from the conducting side as ({^*-) }^- (d{-2) 2}, =1. This mobility edge occurs at a frequency compatible with the Ioffe-Regel condition.