Supposedly the two shooters are in custody. I'm surprised they allowed themselves to be taken alive.
The snipers were armed with rifles. At least some sources suggest police-style body armor (so-called "bullet-proof vests) will not stop rifle bullets, particularly if rounds are jacketed or armor-piercing.
If this becomes a pattern, we will see police refusing to turn out for future crowd control duty. Then riots will turn into insurrections followed by military attacks on rebel-held areas, if our leaders have courage. Alternatively, those areas will become no-go zones for police, much like the favelas of Brazil or the banlieues of France.
Update: A fifth Dallas police officer has died of gunshot wounds.
Update: A fifth Dallas police officer has died of gunshot wounds.