  Following the proposal of arXiv:1312.6673, multi-particle scattering
amplitudes are represented as conserved higher-spin charges. The advantage of
such reformulation is that multi-particle amplitudes acquire the form of an
integral of a closed form in the correspondence unifying usual space-time with
the twistor-like spinor space. This allows one to identify seemingly different
formulae for amplitudes in terms of twistor and space-time integrals. Example
of tree MHV amplitudes of Yang-Mills theory is considered in detail. Our
results are derived using unfolded dynamics formulation of massless fields. In
these terms all information on the amplitude is contained in a single function
$\eta$ that, even for lower spin amplitudes, can be interpreted as a
higher-spin symmetry parameter. The proposed technique can be useful to relate
different approaches to amplitude calculations.
