Molly Delaney, left, holds her 11-year-old daughter, Milly Delaney, Saturday during a service in honor of the victims who died a day earlier when a gunman opened fire at Sandy Hook Elementary School in Newtown, Conn.

Associated Press

A couple of volunteer firefighters place flowers at a makeshift memorial at a sign for the Sandy Hook Elementary school, Saturday, Dec. 15, in Sandy Hook village of Newtown, Conn. The massacre of 26 children and adults at Sandy Hook Elementary school elicited horror and soul-searching around the world even as it raised more basic questions about why the gunman would have been driven to such a crime and how he chose his victims.

Associated Press/Mary Altaffer

A mourner places flowers at a makeshift memorial at a sign for the Sandy Hook school, Saturday, Dec. 15 in Sandy Hook village of Newtown, Conn. The massacre of 26 children and adults at Sandy Hook Elementary school elicited horror and soul-searching around the world even as it raised more basic questions about why the gunman, 20-year-old Adam Lanza, would have been driven to such a crime and how he chose his victims. (AP Photo/Mary Altaffer)

Associated Press/Mary Altaffer

Relatives of victims of violent crimes stand near crosses at the Copacabana Beach, in Rio de Janeiro, in memory of the school shooting victims in Newtown, Conn. The massacre of 26 children and adults at Sandy Hook Elementary school elicited horror and soul-searching around the world.

Associated Press/Silvia Izquierdo

An American flag flies at half-staff as dawn breaks, Saturday, Dec. 15, in Newtown, Conn. A gunman walked into Sandy Hook Elementary School in Newtown Friday and opened fire, killing 26 people, including 20 children.

Associated Press/Jason DeCrow