The results of measurements of the magnetic circular dichroism of the optical absorption (MCDA) and optically detected electron paramagnetic resonance (ODEPR) of X-irradiated KBr:In crystals are presented. The MCDA bands and ODEPR parameters of In°(1) centers and In2+centres have been measured. The mechanism of the energy storage in KBr:In crystals is found not to be simply the formation of correlated F centre-In2+centre pairs as was assumed previously. Considerable similarities to the storage phosphor BaFBr:Eu2+were found for the photostimulated emission and read-out properties.