"left them in suspicious places says it all!"
They left LED signs in dark places where pedestrans walk, near schools like MIT and Harvard. You'd see them in daytime too, if you stuck them under a bridge.
And they're magnetic, so you can't stick them on concrete or a tree.
This is the 21st century version of an advertising poster, it's paperless and battery powered.
Maybe some stupid Demoncrat politician will call for banning these LED devices!
I understand all that, it still doesn't change the fact that valuable resources were used because of the 'misunderstanding'!
At the very least, the people behind this should have to pay for all the expenses associated with the scare.