A racially mixed crowd of demonstrators marched quietly Monday morning in the American city of Saint Louis, Missouri. The demonstrators were protesting a court decision to drop charges against a white former police officer in the shooting death of a black man. The march followed three days of peaceful protests and three nights of violence in St. Louis. The unrest began when a judge said he found Jason Stockley not guilty in the 2011 death of Anthony Lamar Smith. The former officer had been charged with killing Smith after a car chase. Prosecutors accused Stockley of placing a gun on the body. They also said video recorded from his car during the chase captured the officer saying that he was planning to kill Smith. The judge ruled that the lawyers had failed to prove the shooting was not a justified use of force in self-defense.