CLEVELAND, Ohio -- Six Cleveland officers have been fired and six others suspended for their roles in a police chase and shooting that ended with the deaths of two unarmed people, city officials announced Tuesday.

The announcement came more than three years after the officers were involved in a 22-mile chase that began near the downtown Justice Center and ended in a middle school parking lot in East Cleveland on Nov. 29, 2012. Thirteen officers then fired a total of 137 shots at a Chevrolet Malibu, killing Timothy Russell and Malissa Williams.

The shooting lasted 19.3 seconds. The majority of the shots - approximately 120 - were fired in 10.3 seconds, officials said.

The case rocketed the city of Cleveland to the forefront of a national conversation on police use of force, predating the shooting of 12-year-old Tamir Rice by almost two years.

Officer Michael Brelo, the only officer to face criminal charges in the chase and shooting, is among the terminated officers. Brelo was acquitted in May of two counts of voluntary manslaughter. The acquittal resulted in days of mostly peaceful demonstrations that saw about 70 people arrested.

Public Safety Director Michael McGrath, who was police chief when the chase and shooting occurred, handed down the following discipline:

Patrolmen Michael Brelo, Wilfredo Diaz, Brian Sabolik and Michael Farley and detectives Christopher Ereg and Erin O'Donnell were fired.

Patrolmen Paul Box, Cynthia Moore, Randy Patrick and Scott Sistek and Detective William Salupo were suspended for 21 days.

Detective Michael Rinkus was suspended for 22 days.

One of the officers who fired shots that night retired before he could be disciplined, officials said. Detective Michael Demchak, who investigators said fired four shots, did not receive a disciplinary letter.

All of the disciplinary letters can be read at the bottom of this post.

Mayor Frank Jackson said he expects officers will file grievances to appeal their discipline, and that it could be several years before those appeals are resolved.

Cleveland Police Patrolmen's Association President Steve Loomis said Tuesday afternoon that the union has already filed grievances on behalf of the six fired officers, and will file more.

A crime scene photograph taken by the Bureau of Criminal Investigation shows bullet holes in the windshield of the Chevrolet Malibu during the trial of Cleveland police officer, Michael Brelo, April 7, 2015, in Cleveland. The city of Cleveland on Tuesday is expected to announce what discipline Brelo and 12 other officers involved in the chase could face.

"This is unprecedented," Loomis said during a news conference. "Six people got fired after the state attorney general's office cleared them, a grand jury cleared them, [and] a Cuyahoga County judge cleared them. And yet the safety director finds enough there to make these kinds of decisions. It's absolutely politically motivated and insane."

The Critical Incident Review Committee completed its review of the chase in spring 2013. The review of the shooting was put on hold until the end of Brelo's trial and began in summer 2015. Disciplinary hearings were held during the fall.

"What we talked about from the beginning was that we would conduct a process that had due process and would be fair," Jackson said. "And I feel that we have done that."

McGrath said he reviewed hundreds of documents and other pieces of evidence before imposing discipline.

"We did not go through the motions on this," he said.

The officers faced a range of approximately a dozen administrative charges. The most serious accused them of creating a crossfire situation when they formed a semicircle around the Chevrolet and fired at it, said Commander James M. Chura, chairman of the city's Critical Incident Review Committee.

Officials presented diagrams that showed officers were in danger of shooting one another. Further adding to the danger was the fact their aims might have been compromised by factors including adrenaline built up during the lengthy car chase, darkness and flashing police lights, Chura said.

Other administrative charges included joining the car chase without a supervisor's permission and other training and firearm-safety violations.

The news conference included a lengthy overview of the city's review of the chase and shooting. Officials referenced documents, photos and video released in the aftermath of the shooting and during Brelo's trial.

"This incident is unprecedented," Chura said, noting the distance of the chase and the number of officers involved. "It took an investigation just as unprecedented to get to the truth."

In 2013, the city handed down discipline to a dozen supervisors and 74 officers involved in the chase, Chura said.

The chase began when an officer heard what he thought was a gunshot near the Justice Center. During Brelo's trial, prosecutors argued that was the sound of the Malibu backfiring.

Supervisors from the First, Third and Fifth police districts ordered their officers to end their involvement at various times during the chase, Chura said.

The shooting ended when the chase reached Heritage Middle School in East Cleveland. Officers followed the car into the school parking lot and proceeded to block the exit. The shooting began when the car almost hit an officer who was standing outside his cruiser.

Officials showed a video that depicted the actions each officer took during the shooting. The video did not identify the officers by name.

The chase and shooting led the mayor to ask the U.S. Department of Justice to investigate the police department's use of force. The federal investigation found the department too often used excessive force and failed to de-escalate situations. The city negotiated a consent decree that calls for changes in nearly every aspect of the department's policies.

The city of Cleveland also reviewed its police training and policies following the deadly chase and shooting. In 2014, the city implemented a new pursuit policy that includes barring officers from driving after a fleeing suspect unless the suspect is accused of committing a violent felony or driving intoxicated.