Why the hell would anyone open fire on a Mother's Day parade? If it was a parade, it was likely gangbangers shooting at each other, with a crowd in the way, which makes...not a whole lot of sense. You don't need that many witnesses, or cameras, for that matter, looking at you! Not to mention that as a rule, Bad Boys Love Their Mamas, and this won't sit well with gang leadership.
I'm glad that there were no fatalities. And I do hope they are caught without delay.