  We have calculated the leading order amplitude of hard diffractive
electroproduction of two pions in lepton nucleon scattering. At the leading
twist level a pion pair can be produced only in an isospin one or zero state.
We have shown that isoscalar states are produced dominantly for x_{Bj}>0.3 and
with an invariant mass of the two pions close to the threshold (S-wave) and in
the f_2 resonance region (D-wave). These isoscalar pion pairs are dominantly
produced by two collinear gluons.
  Comparing the production of charged and neutral pion pairs as a function of
x_{Bj} and m_pipi one can get information about the gluonic component of
two-pion distribution amplitudes.
