Several dozen protesters marched through downtown Dallas to protest police violence toward blacks while also paying homage to five police officers slain by a sniper during a July 7 demonstration.

The demonstrators marched several blocks from a downtown park to El Centro College, where Micah Johnson gunned down the police officers before being killed after an hourslong standoff.

The march Friday was organized by the Next Generation Action Network, the same Dallas-based civil rights group that held the July 7 protest. The group had been criticized for mounting the protest so soon after the attack. But organizer Dominique Alexander says it's important "to show respect for what officers sacrificed" for the sake of free speech.