St. Louis County Prosecutor Robert McCulloch, left, speaks during a news conference as St. Louis County Police Chief Jon Belmar listens March 15 in Clayton, Missouri. (Scott Olson/Getty Images)
St. Louis County Prosecutor Robert McCulloch, left, speaks during a news conference as St. Louis County Police Chief Jon Belmar listens March 15 in Clayton, Missouri. (Jeff Roberson/AP)
Police officials conduct an investigation in the Ferguson, Mo., neighborhood near the area of the overnight shooting of two police officers on March 12, 2015. (Michael B. Thomas, AFP/Getty Images)
Police mobilize in the parking lot of the Ferguson Police Department headquarters after two officers were shot early on March 12. (Laurie Skrivan / Associated Press)
Police gather outside the Ferguson Police Department early on March 12 after two officers were shot. (Jeff Roberson / Associated Press)
Police canvass the area as they investigate the scene where two police officers were shot outside the Ferguson Police Department early on March 12. (Jeff Roberson / Associated Press)
Police shine a light on a helmet as they investigate the scene where two police officers were shot outside the Ferguson Police Department early on March 12. (Jeff Roberson / Associated Press)
