FBI investigates more suspicious envelopes mailed to government buildings

The FBI is investigating whether a series of envelopes containing a white powder that arrived this week at various government buildings, including the Burbank Courthouse, are linked.

Hazardous materials crews responded to the Burbank courthouse at around 1:30 p.m. Wednesday, where two envelopes — addressed to two judges and containing the substance — had arrived via mail.

Neither envelope had a return address.

FBI spokeswoman Laura Eimiller could not elaborate on how many letters were mailed to how many agencies, though she said authorities were called out on both Wednesday and Thursday.

No injuries have been reported, and no suspects have been arrested, she added.

“None of the letters at this time have been associated with any stated threat other than what could be perceived as an implied threat,” she said.

After being tested in the field, the envelopes were sent to labs for further testing.

The Los Angeles Times reported a similar incident in which someone in the mail room of a Van Nuys Courthouse spotted a “white, dandruff-like powder” on mail addressed to Superior Court Judge Leland B. Harris.

A subsequent investigation revealed the white powder was boric acid, a common ingredient in pesticides and herbicides which can be dangerous if swallowed, according to the Times.

Anyone with information about the incidents is asked to call the FBI at (310) 477-6565.