NEWTOWN, Conn. (CBS Connecticut/AP) — Connecticut authorities are having trouble gathering information off of Adam Lanza’s computers.

Law enforcement sources tell CBS News’ John Miller that the computer hard drives that Lanza smashed before going on his killing spree at Sandy Hook Elementary School are “so badly damaged” that they are going to have a “challenge” retrieving “any information.”

Lanza, who is believed to have suffered from a mental health disorder, killed 26 people, including 20 children, at the Newtown school last Friday. Lanza also killed his mother, Nancy Lanza, before the school massacre.

Lanza was carrying an arsenal of hundreds of rounds of especially deadly ammunition — enough to kill just about every student in the school if given enough time, authorities said, raising the chilling possibility that the bloodbath could have been far worse.

Lanza shot himself in the head just as he heard police drawing near to the classroom where he was slaughtering helpless children, but he had more ammunition at the ready in the form of multiple, high-capacity clips each capable of holding 30 bullets.

Investigators say school shooter Lanza visited an area shooting range but have not concluded whether he actually practiced shooting there.

Ginger Colburn, a spokeswoman for the Bureau of Alcohol, Tobacco and Firearms, would not identify the shooting range in question or say how recently he was there.

She says investigators have concluded that Lanza’s mother visited shooting ranges several times.

Colburn says it’s still not clear whether Nancy Lanza brought her son to the range or whether he ever fired a weapon there.

(TM and © Copyright 2012 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2012 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)


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