Protesters and police face each other during a rally for George Floyd in Minneapolis on Tuesday, May 26, 2020. Four Minneapolis officers involved in the arrest of the black man who died in police custody were fired Tuesday, hours after a bystander’s video showed an officer kneeling on the handcuffed man’s neck, even after he pleaded that he could not breathe and stopped moving. (Richard Tsong-Taatarii/Star Tribune via AP)

MINNEAPOLIS (AP) — To the general public, the video of a white police officer pressing his knee into the neck of a shirtless black man prone on the street, crying out for help until he finally stopped moving, was horrifying.

Four officers were fired a day after George Floyd’s death, a stunning and swift move by the Minneapolis chief with the mayor’s full backing. But despite their dismissal, whether the incident will be considered criminal, or even excessive force, is a more complicated question that will likely take months to investigate.

The officers were dismissed soon after a bystander’s video taken outside a south Minneapolis grocery store Monday night showed an officer kneeling on the handcuffed man’s neck, even after he pleaded that he could not breathe and stopped moving.

Mayor Jacob Frey announced the firings on Twitter, saying: “This is the right call.”

The FBI and state law enforcement were investigating Floyd’s death, which immediately drew comparisons to the case of Eric Garner, an unarmed black man who died in 2014 in New York after he was placed in a chokehold by police and pleaded for his life, saying he could not breathe.

But in the Garner case, local prosecutors, the NYPD’s internal affairs unit, and the Justice Department all finished investigations into the case before the officer was ultimately fired. Garner’s family and activists spent years begging for the officer to be removed.

The officers in the Minneapolis incident haven’t even been publicly identified, though one defense attorney has confirmed he is representing Derek Chauvin, the officer seen with his knee on Floyd’s neck. The attorney, Tom Kelly, declined to comment further.

The police union asked the public to wait for the investigation to take its course and not to “rush to judgment and immediately condemn our officers.” Messages left with the union after the firings were not returned.

Police Chief Medaria Arradondo said the department would conduct a full internal investigation, and prosecutors will decide whether to file criminal charges against the officers involved. The Hennepin County Attorney’s Office said it was “shocked and saddened” by the video and pledged to handle the case fairly. Part of that investigation will likely focus on the intent of the officers, whether they meant to harm Floyd or whether it was a death that happened in the course of police work. The FBI was investigating whether the officers willfully deprived Floyd of his civil rights.

News accounts show Chauvin was one of six officers who fired their weapons in the 2006 death of Wayne Reyes, whom police said pointed a sawed-off shotgun at officers after stabbing two people.

Chauvin also shot and wounded a man in 2008 in a struggle after Chauvin and his partner responded to a reported domestic assault. Police did not immediately respond to a request for Chauvin’s service record.

In Minneapolis, kneeling on a suspect’s neck is allowed under the department’s use-of-force policy for officers who have received training in how to compress a neck without applying direct pressure to the airway. It is considered a “non-deadly force option,” according to the department’s policy handbook.

A chokehold is considered a deadly force option and involves someone obstructing the airway. According to the department’s use-of-force policy, officers are to use only an amount of force necessary that would be objectively reasonable.

But two use-of-force experts told The Associated Press that the officer clearly restrained the man too long. They noted the man was under control and no longer fighting. Andrew Scott, a former Boca Raton, Florida, police chief who now testifies as an expert witness in use-of-force cases, called Floyd’s death “a combination of not being trained properly or disregarding their training.”

“He couldn’t move. He was telling them he couldn’t breathe, and they ignored him,” Scott said. “I can’t even describe it. It was difficult to watch.”

In a post on his Facebook page, the mayor, who is white, apologized Tuesday to the black community for the officer’s treatment of Floyd, 46, who worked security at a restaurant.

“Being Black in America should not be a death sentence. For five minutes, we watched a white officer press his knee into a Black man’s neck. Five minutes. When you hear someone calling for help, you’re supposed to help. This officer failed in the most basic, human sense,” Frey posted.

Police said the man matched the description of a suspect in a forgery case at a grocery store, and that he resisted arrest.

The video starts with the shirtless man on the ground, and does not show what happened in the moments prior. The unidentified officer is kneeling on his neck, ignoring his pleas. “Please, please, please, I can’t breathe. Please, man,” said Floyd, who has his face against the pavement.