At least two separate marches were planned. Both were due to start at the place where Freddie Gray, 25, was detained on April 12 for carrying a switchblade knife and placed inside a police transport van. Gray died on Sunday, a week after his arrest.
A preliminary autopsy report found that Gray had suffered a spinal injury. Authorities have yet to explain the precise time or place he sustained the injury or its cause.
But Baltimore Police Commissioner Anthony Batts said on Friday the officers repeatedly failed to give Gray medical assistance and disregarded department regulations by failing to buckle the man into seat restraints while riding in the van.
Gray was the latest in a series of black men whose deaths have triggered an outcry in the United States over the use of excessive force by law enforcement.