The FBI has revealed that Russia's intelligence services are targeting Americans of "high intelligence value" on private messaging apps, Signal, in a phishing campaign that has resulted in unauthorized access to thousands of individual accounts globally. The hackers target U.S. government officials, military officials, politicians and journalists. The FBI and Cybersecurity and Infrastructure Security Agency (CISA) have warned that Russian actors are specifically targeting Signal accounts, a private messaging service that allows users to share sensitive information and documents. The agencies also indicated that these phishing tactics could be applied to other messaging services. They have urged at-risk Americans to be cautious about opening links or files shared over messaging apps and to report any discovered phishing scams.