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We show that cosmic rays in external galaxies, groups and clusters rich ingas, with an average flux similar to that observed in the Milky Way, could haveproduced the observed extragalactic diffuse gamma radiation.Comment: 9 pages, latex, 1 faxable figure available upon request from  shaviv@tx.technion.ac.il. Submitted to Phys Rev Lett

Origin of the High Energy Extragalactic Diffuse Gamma Ray Background