Update

In about an hour, Congress Avenue will be reopened. By that time, roughly 10 hours will have passed since this vital business district was evacuated.

It is also being reported that two police officers on the scene reported feeling ill, but later “turned out to be fine.”

The evacuation resulted in at least one arrest, when a man wandered into the area.

Given the variety of birds affected (sparrows, grackles, pigeons), the likelihood is that they were poisoned.

Air samples indicate the air is fine, or at least no worse than usual.

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