Prosecutors in the Tamir Rice case "abused and manipulated" the grand jury process to make certain no charges were filed against the officers involved, according to attorneys for the 12-year-old Ohio boy on Monday.

Those were the angry claims hurled immediately after authorities announced the officers would not face criminal charges.

"It has been clear for months now that Cuyahoga County Prosecutor Timothy McGinty was abusing and manipulating the grand jury process to orchestrate a vote against indictment," ABC News reported the attorneys said in a statement.

McGinty also personally recommended to the grand jury that no charges be filed against officers Timothy Loehmann and Frank Garmback.

Video presented during the proceedings showed that Loehmann instantly opened fire on the boy after being summoned to the scene by calls of a man with a gun.

The gun that Rice was holding was later found to be a toy revolver.

"Even though video shows the police shooting Tamir in less than one second, Prosecutor McGinty hired so-called expert witnesses to try to exonerate the officers and tell the grand jury their conduct was reasonable and justified," Rice's attorneys charged. "It is unheard of, and highly improper, for a prosecutor to hire 'experts' to try to exonerate the targets of a grand jury investigation."

In addition, McGinty allowed the officers involved to read prepared statements to the jury under oath without having to face the risk of being cross-examined, prompting defense attorneys to vigorously point out that such special treatment would never be afforded a non-police officer suspect.

"Prosecutor McGinty deliberately sabotaged the case, never advocating for my son, and acting instead like the police officers' defense attorney," the Rice family added in a statement. "As the video shows, Officer Loehmann shot my son in less than a second. All I wanted was someone to be held accountable. But this entire process was a charade."

Despite all the criticism, McGinty stuck by his handling of the case in the aftermath. After the grand jury "heard all the evidence and the applicable law, they were told our recommendation," the prosecutor's office said. "But they made the final decision."

In supporting his position, McGinty pointed to the 70-page report his office released this week in connection with the case as evidence of the extensive work his office did in conducting their investigation.

Meanwhile, Rice family members indicated they plan to continue their crusade in hopes of having the Department of Justice "step in to conduct a real investigation."

The U.S. Attorney's Office for the Northern District of Ohio has previously said it will continue its independent review of the case to "determine what actions are appropriate."