In addition to false alarms (which this appears to be), you have the general background shootings that make DC famous.
It's completely understandable and predictable that this would happen, especially since the real sniper attacks are continuing.
I'm thankful that we're not seeing copycat crimes across the country. It's bad enough that we have one major metropolitan area hyperventilating.
I think we will eventually, though perhaps not immediately; psychopaths all over are getting the idea planted in their brains by the media coverage...just as once we started to have mass school shootings we quickly had a burst of more, as kids had the concept implanted in their brains.
With eight people dead, it's justified.