(JTA) — The FBI is investigating an envelope mailed to the Israeli Embassy in Washington containing a suspicious white powder.

The envelope was discovered Wednesday in the embassy’s mailroom. The powder was tested on site and the envelope taken by the FBI for testing, according to the Associated Press.

The building was not evacuated.

The highly contagious and lethal anthrax bacteria were mailed as a biological weapon to news media and government offices in 2002.