Story highlights Cleveland police officer shot and killed Tamir Rice, 12, on November 22

Officer had been told a man was waving a pistol outside a recreation center

(CNN) The Cuyahoga County Sheriff's Department on Saturday released an investigation report in the Cleveland police shooting of 12-year-old Tamir Rice. While offering no opinion whether two officers should be prosecuted, the report reveals new detail about the shooting.

A city police officer shot and killed Rice on November 22. A citizen had called the 911 center to report a "guy with a pistol" outside a city recreation center, but the responding officers weren't told the caller said the gun might be "fake" and the guy might be a juvenile. Rice actually had a pellet gun.

Here are some of the report's major takeaways:

It's unclear whether officer shouted warnings before shooting

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