New revelations about the shooting death of 12-year-old Tamir Rice by two Ohio police officers involved last November have been released.

Over the weekend, the Cuyahoga County Sheriff's Department released an investigation report in the fatal shooting, which occurred last year after police mistook Tamir's pellet gun for a real firearm and shot him in a park, CNN reports.

Surveillance of the shooting shows that Tamir was walking around and waving a pellet gun outside the Cudell Recreation Center. A man then called 911 to report someone pointing a gun at other people that he believed was "probably fake." Although the caller stated several times that the weapon was likely a toy, the dispatcher did not transmit that information to the responding officers. As a result, the officers believed they were looking for an adult black male on a "gun run," Deputy Chief Ed Tomba said, according to NBC News.

The surveillance also revealed that rookie cop Timothy Loehmann fatally shot the boy two seconds after arriving on the scene. Rice was then left lying in the grass bleeding to death for four minutes until a detective and FBI agent arrived.

Rice died the following day at a hospital.

According to the report, which was released on Saturday, witnesses say that they did not hear the officers shout warnings at Tamir before they opened fire. Officer Loehmann claims that he "shouted verbal commands" from inside his patrol car, but the report says witness interviews do not confirm his statement.

The report alsostates that Rice talked to the FBI agent before dying.

"I asked him his name which he replied to me -- told me, and then he said that he was shot and he made a reference to his, uh, regarding like a gun or a question like, 'Where's my gun?' ... I can't remember exactly what it was. I just remembered that he made reference to a firearm," said the official.