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Definitely. Nearly all lone shootings have reports of multiple gunmen because it is just so chaotic.

https://www.wnyc.org/story/breakingnews-consumers-handbook/

The Breaking News Consumer's Handbook: Active Shooter Edition

>Definitely. Nearly all lone shootings have reports of multiple gunmen because it is just so chaotic.

For example at Columbine one of the shooters removed their trenchcoat, which when talking to victims briefly gave the impression of a 3rd shooter.

It is also safer to assume multiple. You cannot be sure.

Your referenced tweet no longer exists.

Too soon for info, too soon to say anything of substance. It might be better if this were not here at all until more is known. In a vacuum, online, things tend to devolve.

There's another report that it was a man in full body armor:

https://pbs.twimg.com/media/DZ4me3FX4AENDyG.jpg

That's the exact same image as the one in the post you're replying to...

My bad, I had multiple tabs open and got them confused.

sounds like police