Dallas’ main government and police websites were taken offline Monday after automated security systems detected a possible cyber threat originating outside the city’s network, officials said. The activity did not result in a network intrusion or loss of city data.
The outage temporarily cut off online access to information about city departments, elected officials, police services and other public resources. Dallas, the third-largest city in Texas, had an estimated population of 1.33 million in 2025.
The city’s information technology department was notified at 9:55 a.m. Monday that dallascityhall.com, dallas.gov and dallaspolice.net were unavailable, The Dallas Morning News reported. An internal notice sent to employees at 1:11 a.m. Tuesday said access had been restored, ending an outage of more than 15 hours.
City spokesperson Rick Ericson initially said the cause remained unclear. He said Tuesday that the city’s digital security systems had detected a threat from outside the network and automatically taken the websites offline.
“The threat did not result in a network intrusion or a loss of city data,” Ericson told the newspaper.
The outage did not affect 911 or 311 phone or virtual services. DallasGo, the city’s online bill-payment platform, and DallasNow, its permitting portal, also remained accessible.
Dallas.gov redirects users to dallascityhall.com. Dallaspolice.net is the Dallas Police Department’s public website. The outage also blocked access to some public meeting calendars, council agendas and memorandums posted through the city website, D Magazine reported.
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Officials did not identify the type or source of the detected threat or explain what activity triggered the automated response. No threat actor, malware infection, data theft or ransom demand was reported.
The response resembled one in Tallahassee, Florida, in April, when officials took the city’s website offline after detecting a cyberattack affecting parts of its municipal technology environment. Tallahassee officials said staff isolated the threat and reported no operational impact, though periodic downtime remained possible during the review.
Dallas previously suffered a far broader ransomware attack in May 2023 that disrupted municipal courts, 311, police operations and other city systems. The City Council later approved $8.5 million for response and recovery costs.
This week’s disruption was more limited. The websites were restored early Tuesday, essential services remained available, and officials said the detected activity never entered the city network. The city had not said whether its review identified the source of the threat or prompted additional security measures.
