Motive in Shooting of 26 People Still Unclear

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Police aren't saying what may have motivated a man to open fire inside two classrooms at a Connecticut elementary school Friday, but a law enforcement official who has been briefed on the investigation says the gunman was believed to suffer from a personality disorder.

Twenty-six people, including 20 children, were killed in the shooting rampage before the gunman shot and killed himself. Police say another adult was found dead at a second location.

A law enforcement official has identified the gunman as 20-year-old Adam Lanza. The official says Lanza killed his mother at their home before driving his mother's car to the school.

There are questions as to whether the shooter's mother was ever employed at Sandy Hook Elementary. At least one parent says Adam Lanza's mother was a substitute teacher there, but her name doesn't appear on a staff list. And a law enforcement official say investigators are unable to establish any connection so far between her and the school.

Students and their parents describe teachers locking doors and ordering the children to huddle in classroom corners or hide in closets as shots echoed through the building. Authorities said the shootings took place in two nearby classrooms, but they gave no details on exactly how they unfolded.