  We review the expected properties of Pop III and very metal-poor starburst
and the behaviour the Lyman-alpha and HeII 1640 emission lines, which are most
likely the best/easiest signatures to single out such objects. Existing claims
of Pop III signatures in distant galaxies are critically examined, and the
searches for HeII 1640 emission at high redshift are summarised. Finally, we
briefly summarise ongoing and future deep observations at z>6 aiming in
particular at detecting the sources of cosmic reionisation as well as
primeval/Pop III galaxies.
