  We observe a new D_s meson with mass (2856.6 +/- 1.5_{stat.} +/- 5.0_{syst.})
MeV/c^2 and width (48 +/- 7_{stat.} +/- 10_{syst.}) MeV decaying into D^0 K^+
and D^+K^0_S. In the same mass distributions we also observe a broad structure
with mass (2688 +/- 4_{stat.} +/- 3_{syst.}) MeV/c^2 and width (112 +/-
7_{stat.} +/- 36_{syst.}) MeV. To obtain this result we use 240 fb^-1 of data
recorded by the BaBar detector at the PEP-II asymmetric-energy e^+e^- storage
rings at the Stanford Linear Accelerator Center running at center-of-mass
energies near 10.6 GeV.
