Adam Lanza, Sandy Hook Elementary School | featured news

Adam Lanza left a home stuffed with weaponry and carried out the massacre at Sandy Hook Elementary School in a 154-bullet barrage that took less than five minutes, investigators said Thursday in the first detailed account of his surroundings and troubled state of mind.

A family acquaintance says Adam Lanza, who killed 26 at Sandy Hook Elementary School, had not seen his father for two years, despite the father's efforts.

The man who committed mass murder in a Connecticut elementary school attended it in 2002.

An explanation still hasn't emerged for why a man killed 26 people at Sandy Hook Elementary School, but it does appear that he attended the school as a youngster, Connecticut Gov. Dan Malloy told NBC News on Sunday.