Likely one of the military crowd control no-kill weapons.

Did you see the one posted last night that sends a massive thermal pulse? People get really freaked, saying it's like standing in front of a 500 degree oven and you just opened the door. You instinctively run.

There's another one that sense out loud sounds at outrageous decibels to disperse people. Maybe that?

Communications were cut late last night in several cities and they "dispersed" rioters...likely with some of these weapons.