Suisun City, California declared a local state of emergency after a malware attack infected municipal systems and forced officials to shut down the city’s IT network. The intrusion began around 5:45 a.m. and disrupted critical services, including 911 routing, police and fire dispatch lines, and other internal municipal operations, leaving many online city services unavailable.
To maintain emergency response, dispatch operations were moved to Solano County’s second emergency dispatch center while the city worked to contain the incident and preserve evidence. Suisun City said it is coordinating with the FBI, the Department of Homeland Security, and the California Office of Emergency Services on the investigation, but officials have not disclosed how the attackers gained access or identified any responsible threat actor.

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In an August 10 update, Suisun City said police and fire services were still responding to 911 emergencies through the Solano County dispatch center. The city also said there was no imminent threat to the public, while City Hall and some city services remained unavailable due to the network shutdown.
On August 8, Suisun City declared a local state of emergency in response to the cyberattack, and the City Council unanimously approved the declaration. The measure was intended to speed access to emergency resources and support recovery-cost reimbursement.
City officials disclosed the cyber incident in a press release on Saturday. The disclosure stated that the attack had affected emergency dispatch and other municipal systems.
At about 5:45 a.m. on Friday, malicious software infected and compromised Suisun City's municipal IT systems. The incident disrupted 911 routing, police and fire dispatch lines, and other critical city operations, prompting the city to shut down affected systems or its entire IT network.
City officials said they were working with the FBI, the Department of Homeland Security, the California Office of Emergency Services, and other agencies to investigate the malware incident and restore systems. Officials had not disclosed the intrusion method or identified a responsible actor.
To maintain emergency response capabilities during the outage, Suisun City's dispatch team relocated operations to Solano County's second emergency dispatch center. Dispatchers continued handling residents' emergency calls through the county center.
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