"We are aware the website of the Federal Depository Library Program was defaced with pro-Iranian, anti-US messaging," Sara Sendek, a spokesperson for DHS' Cybersecurity and Infrastructure Security Agency told CNN. "At this time, there is no confirmation that this was the action of Iranian state-sponsored actors. The website was taken off line and is no longer accessible. CISA is monitoring the situation with FDLP and our federal partners."
The library program is run by the Government Publishing Office and makes federal documents accessible to the public.
"An intrusion was detected on GPO's FDLP website, which has been taken down. GPO's other sites are fully operational," Gary Somerset, spokesman for the US Government Publishing Office, told CNN. "We are coordinating with the appropriate authorities to investigate further."