Hacking Attack Woke Up Dallas With Emergency Sirens, Officials Say - The New York Times
▻https://www.nytimes.com/2017/04/08/us/dallas-emergency-sirens-hacking.html
Officials in Dallas said the city’s warning system was hacked late on Friday night, disrupting the city when all 156 of its emergency sirens sounded into the early hours of Saturday morning.
The alarms, which started going off around 11:40 p.m. Friday and lasted until 1:20 a.m. Saturday, created a sense of fear and confusion, jarring residents awake and flooding 911 with thousands of calls, officials said.
Mr. Vaz said emergency workers and technicians had to first figure out whether the sirens had been activated because of an actual emergency. And turning off the sirens also proved difficult, eventually prompting officials to shut down the entire system.