Newtown gunman's hard drives a challenge for FBI

(CBS News) The computer hard drives found in the home of the gunman who carried out a murderous rampage on a Connecticut elementary school are presenting a real challenge to law enforcement experts, John Miller reports.

Authorities found the smashed hard drives in the home of the gunman's mother, Nancy Lanza, who investigators say Adam Lanza fatally shot in the head Friday morning before driving her car to Sandy Hook Elementary, where he gunned down 20 students and six adults before turning the gun on himself.

(At left, watch Miller report on the kind of rifle used in last week's massacre)

According to people who have been working with the hard drives, Miller reports they were so badly damaged that authorities face a significant challenge in retrieving any data from them about Adam Lanza. The Connecticut State Police gave the hard drives to the FBI to see if any data can be recovered from them.

The hard drives aren't the only digital lead that investigators are pursuing. Miller previously reported that authorities are also trying to retrieve emails and text messages from the Lanzas' service providers.