The F-B-I says each of the 13 pipe bombs sent to prominent Democrats and C-N-N could have caused a potential explosion.
Director Christopher Wray told an afternoon news conference that the pipe bombs were ``not hoax devices.''
Federal authorities also announced 56-year-old Cesar Altieri Sayoc of Florida has been charged with five federal crimes including mailing explosives and threatening former U-S presidents.
The latest device was found at a mail facility in Sacramento, California addressed to Democratic Senator Kamala Harris.