Okian Warrior writes with word that, as of Monday evening, multiple police agencies and the military were "conducting training exercises over Miami and elsewhere in the county. The exercise includes military helicopters firing machine-gun blanks while flying over highways and buildings. This YouTube video shows helicopters strafing highways with blank rounds near the Adrian Arts center. There are reports of similar actions in Houston From the Houston article: 'if you see the helicopters or hear gunfire, it's only a drill.'"
Note: this time, it's not in The Onion