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What made 156 storm warning sirens all go off?
Last Friday night in Dallas, all of the city's 156 weather sirens went off just before midnight and they went on for an hour and a half.
There was no storm, hackers had managed to get in to the system and set them off.
Robert Wilonsky writes for the Dallas Morning News and he told Eddie Mair that Dallas police will not be involved in finding the culprits. Instead there will be a Federal Police investigation, because it looked like the hackers "had hijacked the radiowaves".
(Photo: Warning sirens Credit: Getty Images)
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