The FBI is assessing what information may have been compromised, sources said.
Following a ransomware attack, Foster City officials say they took most of their computer systems offline as a precaution after discovering suspicious activity. Days later, the issue is still ongoing and public services remain limited.
A cyberattack targeting check-in and boarding systems has disrupted air traffic at several major European airports.
A cyberattack caused Nevada's state offices to close for two days this week and rendered some state websites and phone lines unavailable, the governor's office said Tuesday.
Iranian-affiliated cyber actors and hacktivist groups "may still conduct malicious cyber activity," according to a joint bulletin from U.S. law enforcement agencies.
On Monday, Iran launched a missile attack on a U.S. military base in Qatar that was intercepted. This action increased concerns of other aspects of retaliations against the U.S following the bombings of multiple of Iran's nuclear sites.