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If decays of a heavy particle S are responsible for the diphoton excess withinvariant mass 750 GeV observed at the 13 TeV LHC run, it can be easilyaccomodated in the Standard Model. Two scenarios are considered: production ingluon fusion through a loop of heavy isosinglet quark(s) and production inphoton fusion through a loop of heavy isosinglet leptons. In the second casemany heavy leptons are needed or/and they should have large electric charges inorder to reproduce experimental data on $\sigma(pp \to SX) \cdot \mathrm{Br}(S\to \gamma \gamma)$.

New Physics at 1 TeV?