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We present the result of a study of the X-ray emission from the GalacticCentre Molecular Clouds (MC), within 15 arcmin from Sgr A*. We use XMM-Newtondata spanning about 8 years. We observe an apparent super-luminal motion of alight front illuminating a MC. This might be due to a source outside the MC(such as Sgr A* or a bright and long outburst of a X-ray binary), while it cannot be due to low energy cosmic rays or a source located inside the cloud. Wealso observe a decrease of the X-ray emission from G0.11-0.11, behavioursimilar to the one of Sgr B2. The line intensities, clouds dimensions, columnsdensities and positions with respect to Sgr A*, are consistent with beingproduced by the same Sgr A* flare. The required high luminosity (about 1.510^39 erg s-1) can hardly be produced by a binary system, while it is inagreement with a flare of Sgr A* fading about 100 years ago.

Molecular clouds: X-ray mirrors of the Galactic nuclear activity