CLEVELAND, Ohio -- The mother of Tamir Rice said Monday that police officers tackled and handcuffed her 14-year-old daughter shortly after her 12-year-old son was fatally shot by a Cleveland police officer.

Samaria Rice said that officers also threatened to put her in the back of a police car if she didn't calm down in the minutes after police officer Tim Loehmann shot her son.

Cleveland of Division of Police has not responded to requests seeking to confirm the details released Monday morning as Samaria Rice appeared on national television and at an 11 a.m. press conference at the Olivet Institutional Baptist Church in Cleveland.

Here are other takeaways from the press conference:

1. The Rev. Jawanza Colvin called for the immediate resignation of Michael McGrath, current safety director and former chief of police, and Martin Flask, who was promoted from safety director to Mayor Frank Jackson's executive assistant for special projects in February. Colvin said after Tamir's death and the results of a 21-month Department of Justice investigation that found "systemic deficiencies" in the department's use of deadly force policies and training, the department needs new leadership.

"It has become apparent to us that there is not the ability to implement necessary reforms," Colvin said.

Colvin called for Jackson to conduct a national search for a new safety director.

2. Samaria Rice said someone knocked on her door and told her Tamir was shot twice in the stomach about 3:30 p.m. Nov. 22. She ran to the park and saw her son lying on the ground. She also saw her 14-year-old daughter in the back of a police car. She said she sent her children to Cudell Commons with lunch around noon.

3. Benjamin Crump, the family's attorney, called for the bypassing of a grand jury. In Ohio, prosecutors present evidence in felony cases to a grand jury, which chooses whether or not to indict the accused. Crump called for the case to go straight to a jury trial.

4. Crump posed several questions to Cleveland police on behalf of the family, asking why Loehmann is on administrative leave -- which he called "paid vacation" -- as the department investigates the shooting. Cleveland police said that Loehmann was placed on a standard three-day administrative leave and returned to the force in a limited capacity.

Crump also asked why dispatchers did not tell police that the 9-1-1 caller said the gun Tamir was carrying was "probably fake" twice, and why police did not administer first-aid to the child as he lay shot on the ground.

5. Rice said her idea of justice would be for Loehmann and Frank Garmback, who drove the police car onto the grass directly beside the gazebo where Tamir sat that day, to be convicted.