The agency charged with protecting the president said the
envelope, which was received on Monday at the White House Mail
Screening Facility, initially tested negative.
Biological testing on Tuesday "returned a presumptive positive
for Cyanide," the Secret Service said in a statement, adding the
sample was then sent to another facility to confirm the results.
The agency declined further comment, citing the ongoing
investigation.
There were no injuries from the envelope, according to media
reports.
The Intercept news website, which first reported the incident,
said the envelope contained a milky substance and was in a
container wrapped in a plastic bag.
(Reporting by Peter Cooney; Editing by Eric Walsh)
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