  A search for physics beyond the Standard Model, in final states with at least
one high transverse momentum charged lepton (electron or muon) and two
additional high transverse momentum leptons or jets, is performed using 3.2
fb$^{-1}$ of proton--proton collision data recorded by the ATLAS detector at
the Large Hadron Collider in 2015 at $\sqrt{s}=13$ TeV. The upper end of the
distribution of the scalar sum of the transverse momenta of leptons and jets is
sensitive to the production of high-mass objects. No excess of events beyond
Standard Model predictions is observed. Exclusion limits are set for models of
microscopic black holes with two to six extra dimensions.
