Iran or its affiliates could target U.S. defense industrial base companies via cyberattacks, according to a joint warning from multiple government agencies.

The group of agencies, which includes the Cybersecurity and Infrastructure Security Agency, the FBI, the Defense Department Cyber Crime Center, and the National Security Agency, said Monday that it has not “seen indications of a coordinated campaign of malicious cyber activity in the U.S. that can be attributed to Iran.”