Dallas emergency management officials continue to investigate a hack that activated all 156 emergency tornado sirens citywide for about 90 minutes early Saturday.
The city declared the sirens were activated Friday night in a hack that officials believe came from the Dallas area.
The event was a warning that businesses and organizations, including cities and emergency operations centers, need to guard against similar breaches, whether they may come from disgruntled employees, hackers trying to pull a stunt, or a more nefarious group working for an enemy state, analysts said.
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