[Tweet] Hackers set off Dallas’ 156 emergency sirens over a dozen times https://t.co/f5aweWyvpq #cybersecurity https://t.co/8hlYyxoMph

Hackers set off Dallas’ 156 emergency sirens over a dozen times https://t.co/f5aweWyvpq #cybersecurity https://t.co/8hlYyxoMph