This is actually a thing, and it’s called “swatting”. A tip such as you describe *will *result in the local SWAT coming to your door, weapons drawn. They don’t wait for warrants or confirmation, they just go, because what if it’s not a hoax?
No need to.
I just think your notion that the Paris attack was a relative failure from a terrorist perspective is rather bewildering.
I found your suggestion that you could, theoretically, do a better job to be rather questionable.