  The dynamics of a thin Huygens front propagating through turbulent medium is
considered. A rigorous asymptotic expression for the effective velocity $v_{F}$
proportional to the front area is derived. The small-scale fluctuations of the
front position are shown to be strongly intermittent. This intermittency plays
a crucial role in establishing a steady state magnitude of the front velocity.
The results are compared with experimental data.
