ATLANTA (AP) — A Georgia prosecutor is suing the U.S. Department of Justice over its refusal to provide information about how officers shot 59 bullets into a schizophrenic college student.

Fulton County District Attorney Paul Howard said Friday that federal authorities have blocked his prosecutors from interviewing the officers who killed Jamarion Robinson, 26.

Howard said the federal agency has also stymied his investigation of the 2016 killing by refusing to turn over any documents, despite numerous requests during the past two years under the federal Freedom of Information Act.

"My son deserves the truth," Robinson's mother, Monteria Robinson, said Friday. "If there is nothing to hide, then produce the evidence to Paul Howard's office."

The situation "is extraordinarily unusual," said Atlanta criminal defense lawyer Page Pate, who isn't involved in the case but has handled numerous others involving the federal government.

"They stonewall plaintiffs all the time, but it is unusual for them to stonewall a district attorney who is investigating a possible crime," Pate said.

"Normally this is all worked out between the jurisdictions," Pate added. "They generally cooperate when it comes to investigating serious crimes."

Robinson died in a hail of gunfire after a fugitive task force whose members were armed with weapons that included submachine guns broke down the door of a suburban Atlanta apartment in August 2016, the lawsuit states.

Witnesses and videos have indicated that officers gave numerous verbal commands for Robinson to put down a weapon, the Georgia Bureau of Investigation said in a statement the day after the shooting. The GBI investigates many shootings by police across the state, as it did Robinson's death.

A handgun found at the scene was "believed to be associated with Robinson," the GBI said at the time.

East Point police have said Robinson was suspected of shooting at Atlanta officers that summer, and members of the task force had gone to the apartment to arrest him.

The Department of Justice did not immediately return a request for comment Friday. Its Office of Public Affairs said in an email that due to the partial government shutdown, messages "may not be returned until funding is restored."

Robinson had attended Clark Atlanta University and had been transferring to Tuskegee University in Alabama shortly before he was killed.