Rev. Jesse Jackson says the nation's urban centers are in a crisis created by structural injustice.

Jackson spoke at a commencement ceremony at Morgan State University, a historically black school, on Friday, two days after a mistrial in the case of one of six Baltimore police officers charged in Freddie Gray's death.

Jackson calls the city "a metaphor for abandoned urban America, not protected by laws, not corrected by investment." He calls Gray, a 25-year-old black man who died after he was injured in police custody, a symbol of too many youth in urban zones "profiled, arrested and killed in police custody without deterrents for misconduct."

Jackson says people should be marching, not only because Gray is dead "but because of reduced life options and the way he died."