Security upgrades added to Dallas emergency siren system

DALLAS (AP) — Officials in Dallas say they’ve completed security upgrades to the city’s outdoor sirens that will prevent the kind of “malicious activation” that caused the emergency system to blare across the city in April.
Authorities said in a statement Monday that the city’s more than 150 sirens now have “constant encrypted communication.”
They say the security enhancements were completed in late May and the next round of testing is scheduled fo