Cyberattack Disrupts Suisun City Operations, Triggers State of Emergency A cyberattack struck Suisun City, California, early Friday morning, crippling critical municipal systems, including 911 emergency services. The incident began around 5:45 a.m., prompting the Suisun City Council to declare a state of emergency on Saturday as IT teams worked to contain the breach. The malicious software compromised city infrastructure, forcing officials to take affected systems offline. While details on the attack’s origin and scope remain limited, the disruption to public safety operations underscores the vulnerability of local government networks. City Hall at 701 Civic Center Blvd. serves as the central hub for impacted services. Authorities have not disclosed whether the attack involved ransomware or other forms of malware, nor have they confirmed if data was exfiltrated. The incident follows a growing trend of cyber threats targeting municipal and emergency response systems, raising concerns about preparedness and resilience in smaller jurisdictions. Investigations are ongoing.

Suisun City Declares State of Emergency Following Cyberattack on Critical Services On August 4, 2025, Suisun City, located in Solano County, California, suffered a cyberattack that disrupted key municipal operations, including public safety systems. The incident began at approximately 5:45 a.m. when "malicious software" infiltrated the city’s IT infrastructure, prompting an immediate shutdown of its entire network to preserve evidence for a federal investigation. The attack impacted critical services such as 911 routing, police and fire dispatch, and city records management. While emergency call handling was rerouted to Solano County’s dispatch center, some software-dependent functions became temporarily unavailable. City officials confirmed there was no direct threat to public safety, though residents may experience delays in non-emergency services like bill payments and permit processing. Suisun City declared a state of emergency on August 5, enabling faster access to emergency resources and potential cost recovery. The city is collaborating with the FBI, the Department of Homeland Security, and the California Office of Emergency Services to investigate the breach and restore systems. No timeline has been provided for full recovery. The attack follows a recent trend of cyber incidents targeting local governments in the region. Earlier in 2025, Foster City and Pittsburg faced similar disruptions, with Foster City declaring a state of emergency after a March ransomware attack and Pittsburg losing nearly $1 million in a February phishing scam. Cybersecurity experts note that municipalities are frequent targets due to perceived vulnerabilities, often with ransom demands as the primary motive.