The school was closed and 481 students and teachers were evacuated while investigators determined whether the letter actually contained anthrax.
(The school; was; closed) (481 students and teachers; were evacuated; T:while investigators determined whether the letter actually contained anthrax) (investigators; determined; whether the letter actually contained anthrax) Context(investigators determined,List([73, 97))):(the letter; actually contained; anthrax)
investigators determined,List([73, 97))
The school 481 students and teachers investigators the letter
was were evacuated determined actually contained
closed
T:while investigators determined whether the letter actually contained anthrax
whether the letter actually contained anthrax
anthrax