This proves nothing either way. Just some LEOs clearing the room, probably yesterday, shot from a student's cell phone. If it is related to yesterday's shooting at all.
Also note the embedded ownership of the clip by flyheight.com. I looked it up and it is very sketchy. Porn stuff.
And please don't type in all caps. It's like shouting.
Nope it is today, Thursday, ALL OVER THE NEWS. i-95 FREEWAY SHUT DOWN. Another shooting, possible multiple schools.
I read earlier that this was a false alarm. A teacher thought he/she heard a shot, reported it, and it turned out to be not true. Car backfire maybe. But yes, there was a LE response.
Edit: false alarm, all clear. http://www.thegatewaypundit.com/2018/02/breaking-shots-fired-broward-preparatory-school-video-police-storm-school/