Eleven police officers were shot, four of them fatally, when two snipers opened fire with rifles in downtown Dallas on Thursday evening during a protest over recent police shootings in other states, police said One suspect was arrested late Thursday after a shootout with the Dallas police, Chief Brown said A suspicious package was found near the suspect and was being secured by a police bomb squad A second man, whose photo the Police Department had released as a “person of interest,” had turned himself in, and other “persons of interest” were being questioned