Four East Bay police departments received suspicious envelopes containing white powder Friday.
The Alameda County Fire Department's Hazardous Material Team responded to four reports of white powder found at local law enforcement headquarters, Friday.
In each case, legal-sized white envelopes containing a suspicious white powdery substance arrived via mail.
The first call came in at 10:14 a.m. from the Hayward Police Department and similar calls followed from police departments in San Leandro, Union City and Berkeley. It is still unknown if any other agencies received a similar envelopes.
The substances found in Hayward, San Leandro and Berkeley were deemed non-hazardous, while the scene in Union City is still under investingation.
The FBI is assisting local law enforcement agencies with their investigation, according to spokesperson Julie Sohn.