Evidence markers are seen in a plaza at the area …

AP | published: July 8, 2016

Evidence markers are seen in a plaza at the area of the attack on Dallas police officers last night in Dallas, Friday, July 8, 2016. A peaceful protest in Dallas over the recent videotaped shootings of black men by police turned violent Thursday night as an unknown number of people shot at officers, killing five and injuring seven, as well as two civilians. (Gerald Herbert | AP Photo)