  A search is conducted for hadronic three-body decays of a new massive
coloured particle in sqrt(s) = 7 TeV pp collisions at the LHC using an
integrated luminosity of 4.6/fb collected by the ATLAS detector. Supersymmetric
gluino pair production in the context of a model with R-parity violation is
used as a benchmark scenario. The analysis is divided into two search channels,
each optimised separately for their sensitivity to high-mass and low-mass
gluino production. The first search channel uses a stringent selection on the
transverse momentum of the six leading jets and is performed as a counting
experiment. The second search channel focuses on low-mass gluinos produced with
a large boost. Large-radius jets are selected and the invariant mass of each of
the two leading jets is used as a discriminant between the signal and the
background. The results are found to be consistent with Standard Model
expectations and limits are set on the allowed gluino mass.
