(Submitted on 19 Dec 2012) We report the first observation in a high energy neutrino telescope of cascades induced by atmospheric electron neutrinos and by neutral current interactions of atmospheric neutrinos of all flavors. Using data recorded during the first year of operation of IceCube's DeepCore low energy extension, a sample of 1029 events is observed in 281 days of data. The number of observed cascades is $N_ = 496 \pm 66 (stat.) \pm 88(syst.)$ and the rest of the sample consists of residual backgrounds due to atmospheric m
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