PARK SLOPE - A group of concerned parents in Brooklyn say they want the city to lift the ban on cell phones in public schools after the brutal murder of an 8-year-old last week.

Police say Leiby Kletzky was killed and his body dismembered after he was kidnapped on his way back from a day camp. Levi Aron, the man accused of the crime, underwent psychological testing over the weekend to determine if he is mentally competent to stand trial.

The group, called the New York City Parents Union, says having a cell phone would be a lifeline for children in emergencies and called on Mayor Michael Bloomberg to lift the ban.

The mayor's office, however, stood by the ban today and issued a statement saying, "When kids are in school, parents know where they are and mobile devices are major distractions that prevent all the other students in the classroom from learning."

Attorney for BK murder suspect speaks with News 12Police still collecting evidence at BK murder suspect's homeShomrim Patrol assisting in Leiby Kletzky murder probe Lawyer: Levi Aron not mentally fit to stand trial