A suspicious package addressed to CNN's office in Atlanta was intercepted on Monday, the network said, adding that all of its mail is being screened off-site.
The announcement comes three days after the FBI arrested Cesar Altieri Sayoc and accused him of trying to send improvised explosive devices to high-profile Democrats and media targets. He is facing charges for five federal crimes, including the illegal mailing of explosives.
The Atlanta package is "similar in appearance to the others" that were addressed to CNN, the FBI said shortly after noon on Monday.
Packages linked to Sayoc have used the address of Rep. Debbie Wasserman Schultz's office in South Florida as their return address. Despite Sayoc's arrest, the authorities have warned that there may be other packages still working their way through the postal system.