Updated: 22/10/16 : 13:14:29Printable Version
Hillary Clinton's campaign headquarters has been evacuated after a white powdery substance was discovered in an envelope.
New York Police said four people were exposed to the substance but no injuries or illnesses have been reported.
The envelope also contained writing but no death threats, according to authorities.
It was delivered to a Manhattan campaign office and found by two interns before being taken to Mrs Clinton's Brooklyn headquarters.
The 11th floor of the building was evacuated after the alert and the suspicious substance was tested.
It was not immediately known what the substance was, but police said early indications suggested it was not hazardous.
Lieutenant Thomas Antonetti said: "The preliminary investigation determined that it was negative in terms of containing a hazardous substance."
He added: "We're trying to determine what the substance was.
"For right now, we can at least rule out any poisonous or deadly nature of the substance."
On 8 November, Democrat Mrs Clinton takes on Republican Donald Trump in the US presidential election.
She currently leads in national polls after her rival's campaign was rocked by a series of sexual misconduct allegations against the billionaire businessman.
He denies the claims made by a number of women in the US.