"I'm looking for a conviction for both of the officers," Samaria Rice, the mother of Tamir Rice, said Monday on ABC's "Good Morning America" program.

"He was just a wonderful kid," she said. "He was my baby."

Tamir Rice was fatally shot on November 22 at a park in Cleveland after a rookie police officer mistook his toy gun for a real one.

The boy’s mother has already filed a wrongful death lawsuit against the city of Cleveland and both Timothy Loehmann, the officer who shot Rice, and Frank Garmback, who was driving the police car.

She also criticized the police for how they treated her when she was trying to reach for her fatally injured son.

Mass demonstrations have erupted across the US in recent months over an epidemic of police brutality against African Americans.

Dozens of protests have been staged around the country since Wednesday after a grand jury decided not to indict New York City police officer Daniel Pantaleo in the chokehold death of Eric Garner on July 17.

The outrage echoes the reaction of protesters after a St. Louis grand jury decided last month not to indict a white police officer in the August shooting death of Michael Brown in Ferguson, Missouri.

Based on a recent study by the Malcolm X Grassroots Movement, 313 black people were killed in 2012 by police officers, private security guards and members of the public and in most cases, the perpetrator was not indicted.