Not sure they are actually shooting at EMS. I have not heard a report of them "hitting" EMS or LEO's.
I think the majority of it is shooting in the air to cause fear and panic.
They are however using this excuse to shoot each other, usually drive by style. Female shot in the face two nights ago, shots fired from a "large black SUV with large rims. Three nights ago two cars chasing each other, eastbound I-270, shooting at each other. (Gang-style criminals)
The fires on the first night were all allowed to burn because the area could not be secured for the FD's to respond. Even the second night I heard another fire burning and the call was "Fire Dept will NOT be responding."
The people of Ferguson are peaceful (for the vast majority) and are not "burning down where they live." It is a major criminal element coming in from all corners using this as an excuse to come in and be the criminals they are.
I've heard of people arrested from other areas of St. Louis, Oklahoma, Cali, Oregon,Texas, New York, and (this one blew my mind) one cat arrested came all the way from GERMANY to stir up someone else's litterbox..
I grew up in the Black Panther riots of '1967 - '1968, too young to remember much but I remember it.
Never thought the Ferguson thing would go this far, never really thought I would see it again. But what do I know...