A lengthy report published Saturday revealed new details about the fatal shooting of 12-year-old Tamir Rice by a Cleveland police officer, but made no recommendation on whether the officer or his partner should face criminal charges.

The report by the Cuyahoga County Sheriff’s Department also left some major questions unanswered. Perhaps foremost: Did Officer Tim Loehmann issue a warning before firing the fatal round? The police have said he did, but the new report suggested no witnesses heard any warning before shots were fired.

In the coming weeks or months, a grand jury is expected to hear evidence in the case and decide whether to bring indictments against Officer Loehmann and his partner, Officer Frank Garmback.

But the sheriff’s investigation provided the clearest picture yet about what happened on Nov. 22 outside the neighborhood recreation center that Tamir frequented, and where just before the shooting he had been using a newly acquired fake gun that looked strikingly like the real thing.