"There is no imminent threat to the public," the city said. "All public safety services remain active." The city shut down its computer network "to contain the threat and preserve evidence for a federal investigation," it said... Suisun City dispatchers were taking calls for service through the Solano County dispatch center. Suisun City police officers and firefighters continued responding to calls for service, the city said, but online city services and internal operations were unavailable.
On Facebook the city said it was "working alongside federal, state and regional agencies, including the FBI, Department of Homeland Security and California Office of Emergency Services to maintain emergency services, investigate the incident and restore systems."
But Bay Area PBS station KQED notes "They're only the latest local government in the region to be hit by a cyberattack."
Earlier this year, Foster City and Pittsburg experienced other cyberattacks that impacted services in their own jurisdictions. Foster City declared a state of emergency after a March ransomware incident that shut down many services for more than a week. Pittsburg lost almost $1 million to a February phishing attack, though over half of it was recovered.