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We report the first observation of two Cabibbo-suppressed decay modes, Xi_c+-> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+. We observe 59+/-14 over abackground of 87, and 22+/-8 over a background of 13 events, respectively, forthe signals. The data were accumulated using the SELEX spectrometer during the1996-1997 fixed target run at Fermilab, chiefly from a 600GeV/c Sigma- beam.The branching ratios of the decays relative to the Cabibbo--favored Xi_c+ ->Xi- pi+ pi+ are measured to be B(Xi_c+ -> Sigma+ pi- pi+)/B(Xi_c+ -> Xi- pi+pi+) = 0.48+/-0.20, and B(Xi_c+ -> Sigma- pi+ pi+)/B(Xi_c+ -> Xi- pi+ pi+) =0.18+/-0.09, respectively. We also report branching ratios for the same decaymodes of the Lambda_c+ relative to Lambda_c+ -> p K- pi+.

First Observation of the Cabibbo-suppressed Decays Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+ and Measurement of their Branching Ratios