NEWTOWN, Conn. (AP) Authorities investigating the school shooting in Newtown say they're looking into all aspects of the shooter's life.

State police spokesman Lt. J. Paul Vance said Thursday investigators are ``looking at everything to do with the shooter, his history, medical, psychological, education, family history, everything and anything relative to him we're examining.''

Adam Lanza shot his way into Sandy Hook Elementary School on Dec. 14 and slaughtered 20 first-graders and six educators. The 20-year-old Lanza also killed his mother that morning and committed suicide as police arrived.

Vance said investigators are making progress. He could not provide a timeframe for when the investigation might conclude.

He said children would only be interviewed if necessary.

Police have yet to offer a possible motive for Lanza's rampage.