  A search for strongly produced supersymmetric particles is conducted using
signatures involving multiple energetic jets and either two isolated leptons
($e$ or $\mu$) with the same electric charge, or at least three isolated
leptons. The search also utilises jets originating from b-quarks, missing
transverse momentum and other observables to extend its sensitivity. The
analysis uses a data sample corresponding to a total integrated luminosity of
20.3 fb$^{-1}$ of $\sqrt{s} =$ 8 TeV proton-proton collisions recorded with the
ATLAS detector at the Large Hadron Collider in 2012. No deviation from the
Standard Model expectation is observed. New or significantly improved exclusion
limits are set on a wide variety of supersymmetric models in which the lightest
squark can be of the first, second or third generations, and in which R-parity
can be conserved or violated.
