[1/3] A general view of Sandy Hook prior to the 10th remembrance of the Sandy Hook school massacre in Newtown, Connecticut, U.S., December 8, 2022.
He was among 20 first graders gunned down inside Sandy Hook Elementary in Newtown, Conn., on Dec. 14, 2012.
At least 11 school shooting plots have been foiled in recent years because of the training Sandy Hook Promise provided, the group says.
Speakers included former U.S. President Barack Obama, who was in the White House when the Sandy Hook shooting took place.
Mark Barden, whose son, Daniel, was killed at Sandy Hook, co-founded Sandy Hook Promise with Hockley.