With no explanation, label each line with "O", "product-weapon", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
On
the
afternoon
of
16
August
,
members
of
a
contingent
of
the
South
African
Police
Service
,
from
an
elite
special
unit
,
opened
fire
with
assault
rifles
(
R5
rifles
)
,
on
a
group
of
strikers
.
On:O
the:O
afternoon:O
of:O
16:O
August:O
,:O
members:O
of:O
a:O
contingent:O
of:O
the:O
South:organization-other
African:organization-other
Police:organization-other
Service:organization-other
,:O
from:O
an:O
elite:O
special:O
unit:O
,:O
opened:O
fire:O
with:O
assault:O
rifles:O
(:O
R5:product-weapon
rifles:product-weapon
):O
,:O
on:O
a:O
group:O
of:O
strikers:O
.:O