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We show that the resonance-like structure found by the \emph{CELSIUS-WASACollaboration} in the two-photon invariant mass spectrum of the reaction $pp\to pp \gamma \gamma$ is rather a signature of the $NN$-decoupled dibaryonresonance $d^\star_1$(1956) that is produced in the radiative process $pp \to\gamma d^\star_1$ and then undergoes radiative decay into two protons$d^\star_1 \to pp \gamma$. It is found that a contribution of the dibaryonmechanism $pp \to \gamma d^\star_1 \to pp \gamma \gamma$ of the reaction $pp\to pp \gamma \gamma$ to the invariant mass spectrum of its photon pairs canreasonably well reproduce the experimentally observed spectrum in the vicinityof the resonance-like structure.

On a possible origin of a resonance-like structure in the two-photon invariant mass spectrum of the reaction pp->ppgg