Police have been unable to recover data from gunman Adam Lanza's computer after the 20-year-old deliberately sabotaged the machine's hard-drive, investigators have said.
Forensic experts revealed the software had been smashed so extensively that attempts to retrieve potentially crucial evidence such as emails had failed.
A joint effort to piece together the remains of the hard-drive, reported to have been damaged with a screwdriver or hammer, was undertaken by both Connecticut State police and the Federal Bureau of Investigation.
Authorities had hoped its data would shed some light on the reason for Lanza's deadly killing spree. Detectives have so far been unable to provide any definitive link between the young man and the school he attacked.
"It looked like he took steps to damage it – he smashed it," an official connected to the investigation reporters. Lanza (below) shot dead 20 children under the age of eight as well as six teachers at Sandy Hook Elementary School, Newtown, last Friday.
Federal investigators have since interviewed at length both his father Peter, a tax specialist, and his elder brother Ryan (24) in an effort to determine the catalyst behind the attack. But despite hours of questioning it is understood the pair were unable to explain why Lanza acted so violently.
"In all that time, they got no real information that could help figure this out," an official who wished to remain anonymous said. Meanwhile, Lieutenant Paul Vance, a spokesman for State police, said investigators were continuing to "examine everything and anything" relevant to the shooting, including mobile phones and computer game consoles. (© Daily Telegraph, London)