With no explanation, label each line with "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Within
hours
,
there
was
a
citywide
manhunt
and
Boston
authorities
advised
citizens
to
shelter
in
place
...
Within:O
hours:O
,:O
there:O
was:O
a:O
citywide:O
manhunt:O
and:O
Boston:organization-government/governmentagency
authorities:organization-government/governmentagency
advised:O
citizens:O
to:O
shelter:O
in:O
place:O
...:O