SANFORD, Fla. — A Florida judge is asking an additional six potential jurors for George Zimmerman's trial to return next week for further questioning, raising the total asked back so far to 29.

Judge Debra Nelson on Friday asked the potential jurors to return Tuesday. She told them not to discuss the case or selection process with anyone.

Prosecutors and defense attorneys need to find six jurors and four alternates to sit on the jury for Zimmerman's trial.

Zimmerman is charged with second-degree murder for fatally shooting Trayvon Martin. He is pleading not guilty, claiming self-defense.