Dallas city officials said Saturday that a hacker is to blame for setting off all the city's 156 emergency outdoor sirens, which wailed for an hour and half overnight.
Rocky Vaz, director of the city's Office of Emergency Management, said engineers determined an unidentified hacker somewhere in the Dallas area was responsible, but has not been tracked down.
The hacker tricked the system to send repeat signals activating each siren 60 times during the night, Vaz said.
The sirens started sounding at 11:42 p.m. Friday and continued until 1:17 a.m. Saturday.
The blaring sirens, used primarily to warn of tornadoes and other severe weather, prompted anxious residents to call 911, clogging up that system.
Mayor Mike Rawlings said in a statement that the hack was an attack on Dallas' emergency notification system, and that the city will "find and prosecute whomever is responsible.".
Locating the hacker, however, "is going to be a very long process if we do find out who actually did it," Vaz said.
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