Dallas warning sirens set off by hacker

The sirens are usually used to warn of extreme weather events such as tornadoes. “All 156 sirens in the city were activated last night – it does appear at this time that it was a hack,” a spokeswoman for the city told reporters. The noise “woke up a lot of people”, she added. The sirens were activated at 23:42 local time (04:42 GMT) on Friday and lasted for about 90 minutes. Some posted footage online in which the sirens can clearly be heard. Technicians for the Office of Emergency Management…

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