A report on the investigation int the Sandy Hook shooting will be released today. On Dec. 14, 2012, 20 first-graders and six staff members were gunned down at the elementary school in Newtown, Conn., by 20-year-old Adam Lanza before Lanza took his own life. Take a look back at images from that tragic day.
A third grade student at Sandy Hook Elementary School describes a shooting at the school on Friday.
President Barack Obama wipes away a tear as he speaks about the shooting at Sandy Hook Elementary School in Newtown, Conn.
A vigil is held at a nearby church after the shooting.
Secret Service Director Julia Pierson, who has faced intense scrutiny over the Sept. 19 White House security breach, has resigned, according to the U.S. Department of Homeland Security. Here's what you should know about the highly secretive agency.