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Recent experimental developments of high-intensity, short-pulse XUV lightsources are enhancing our ability to study electron-electron correlations. Weperform time-dependent calculations to investigate the so-called "sequential"regime (photon energy above 54.4 eV) in the two-photon double ionization ofhelium. We show that attosecond pulses allow to induce and probe angular andenergy correlations of the emitted electrons. The final momentum distributionreveals regions dominated by the Wannier ridge break-up scenario and bypost-collision interaction.

Probing Electron Correlation via Attosecond XUV Pulses in the Two-Photon Double Ionization of Helium