That can kill people though. Not that in this situation any of the vulnerable people would be out there.
Same short term I don't have a clue. Civilians in police clothing?
Anything can kill people though. I'm firmly against doing any action that has a high chance of a fatality (such as opening fire on the rioters, like some people have said on here) but you need something forceful and firm enough to make these people think twice. Something along the lines of a taser should be enough.
Make it known that there will be a heavy army presence in most areas after curfew and that they have permission to use their tasers should they feel the need to.