  The LHC collaborations ATLAS and CMS recently reported on the excess of the
events in the diphoton final states at the invariant mass of about $750~
\text{GeV}$. In this article we speculate on the possibility that the excess
arises from the neutral CP-even component $\phi$ of the scalar triplet $ \Phi $
of the $SU(3)_{c}\times SU(3)_{L}\times U(1)_{X}$ $(3\text{-}3\text{-} 1)$
model that has a $U(1)_{X}$ charge equal to $X=-1/3$ and acquires a vacuum
expectation value larger than the electroweak symmetry breaking scale. The
interactions of the scalar field $\phi$ to the photon- and gluon-pairs are
mediated by the virtual vector-like fermions which appear as components of the
anomaly-free chiral fermion representations of the $3\text{ -}3\text{-}1$ gauge
group.
