  We propose a new explanation for excess events observed in the search for a
high-mass resonance decaying into dibosons by the ATLAS experiment. The
resonance is identified as a composite spin-$0$ particle that couples to the
Standard Model gauge bosons via dimension-5 operators. The excess events can be
explained if the dimension-5 operators are suppressed by a mass scale of ${\cal
O}(1$-$10$) TeV. We also construct a model of hidden strong gauge dynamics
which realizes the spin-$0$ particle as its lightest composite state, with
appropriate couplings to Standard Model gauge bosons.
