All 156 emergency sirens were activated around 11:40 p.m.in what appeared to be a hacking incident that "woke up a lot of people", Sana Syed, managing director of public information for the city of Dallas, said at a news conference on Saturday. You can monitor the City of Dallas on Twitter or Facebook and Dallas Office of Emergency Management on Twitter or Facebook.
He said his office eventually had to shut down the system, which is used to alert people to shelter indoors during severe weather.
Although the city says it determined how the system was hacked, they continue to investigate who did it.
WFAA viewers reported sirens sounding in other communities besides Dallas. We have notified the FCC for assistance in identifying the source of this hack.
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Mayor Mike Rawlings said the hack was an attack on Dallas' emergency notification system, and that the city will "find and prosecute whomever is responsible".
City officials hope to have the system up and running by Sunday or Monday at the latest.
Crews were working to manually shut down the sirens, but warned it could take up to 3 hours for a complete shutdown to occur, according to a city statement.
"We shut it down as quickly as we could", Vaz said, "taking into consideration all of the precautions and protocols we had to take to make sure that we were not compromising our 156 siren system".