Update on Dallas sirens
By Sana Syed, City of Dallas Public
April 10, 2017
11:42 p.m. Friday night, all 156 sirens in the City of Dallas were
activated. The Office of Emergency Management, OEM, immediately began to
go through various protocols to turn the sirens off. By 1:17 a.m., OEM
was successful in deactivating the entire outdoor warning siren system.
OEM worked with engineers throughout the night to determine what
triggered the sirens.
We can state at this time that the City’s siren system was hacked Friday
night. For security reasons, we cannot discuss the details of how this
was done, but we do believe that the hack came from the Dallas area. We
have notified the FCC for assistance in identifying the source of this
hack. We are putting in safeguards to ensure this type of hack does not
now, our priority is to work on reactivating our system. We won’t know
the health of our sirens until we reactivate the system. We ask
residents to be patient with us in case the sirens sound again during
re-activation and please do not call 911 or 311 for concerns about
Please monitor the City of Dallas and Dallas OEM on Twitter or Facebook,
because we issue a public notice via social media when we’re about to
test sirens. Siren testing is only done at noon on the first Wednesday
of each month, weather permitting.