FREMONT (CBS SF) — A suspicious envelope containing a white substance was delivered to the Fremont Police Department Monday morning, a police spokeswoman said.
Around 11 a.m., Fremont police received the envelope by mail, and the employee who received it immediately notified her supervisor, Officer Geneva Bosques said.
Bosques said Fremont police were already on alert and have been keeping an eye out for such a delivery since Friday.
The envelope was taken outside and caused no major disruption to the department, Bosques said.
The FBI has taken possession of the mail to analyze it, Bosques said.
Tests up to this point have been negative for anything hazardous, but sending a hoax letter is a serious federal crime, an FBI spokeswoman said.
The FBI is continuing to work closely with all the departments that received a suspicious letter. Any tips can be called in to the FBI tip line at (415) 553-7400.
(Copyright 2012 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)