Google said Monday that it had disrupted a criminal group’s attempt to use artificial intelligence to exploit another company’s previously unknown digital vulnerability, adding to heightened worries across government and private industry about AI’s risks for cybersecurity.

Microsoft says state-backed Chinese hackers have been targeting U.S. critical infrastructure and could be laying the technical groundwork for the potential disruption of communications between the U.S. and Asia in future crises.

The Justice Department says three Iranian citizens have been charged in the United States with ransomware attacks that targeted power companies, local governments and small businesses and nonprofits, including a Pennsylvania domestic violence shelter.