  The IceCube Neutrino Observatory features both a kilometer-cubed detector
between 1.45 and 2.45 km depth and an array of ice-filled tanks, called IceTop,
located at the surface. The presence of both detectors at the same location
allows for detailed studies of cosmic rays and their muon content in ice, while
the lack of signals in the surface detectors can be used to identify muon
tracks in the deep detector as neutrino candidates and to determine the veto
efficiency of IceTop. While the solid angle coverage of the current detectors
is limited, this has interesting implications for the design of a larger
surface array. In this contribution, we present the results from this study
applied to 5 years of data. We find a few interesting neutrino candidate events
that pass the cuts designed to veto cosmic rays. Thorough simulations are
necessary to establish the likelihood for these events to be astrophysical
neutrinos or rare cosmic rays.
