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Newtown shooting: Final report reveals 'painful' details
US police have released thousands of documents related to their investigation into the killing
of 26 people at a school in Connecticut.
Officials described as "painful" some of the details in the report, which includes photos
and transcripts.
It reveals new facts about the life of gunman Adam Lanza, 20, said to have suffered from
mental health issues.
Lanza turned a gun on himself after opening fire at Sandy Hook Elementary School in Newtown
in December 2012.
Before killing 20 children and six adults with a semi-automatic rifle, he shot dead
his own mother at the family home. She had bought him the weapons used in the rampage.
Last month, Connecticut police published a summary of their findings, showing that Lanza
had "an obsession" with the 1999 Columbine massacre, during which two teenagers killed
12 students and a teacher.
Investigators also found that Lanza had acted alone and planned the shooting, which took
less than 11 minutes.
The final report contains evidence that Lanza's mother discussed her son's "disabilities"
with a friend the day before the Sandy Hook attack.
One of the gunman's former teachers said Lanza's creative writing was "so graphic that it could
not be shared". The student would "write 10 pages obsessing over battles, destruction
and war".
The findings also reveal autopsy reports and new information about how the shooting unfolded.
A teacher hiding in a closet said he heard janitor Rick Thorne challenge Lanza. Mr Thorne,
who survived the attack, apparently yelled "Put the gun down".
Among the audiovisual material released on Friday were photos of items found in Lanza's
home, including numerous rounds of ammunition, gun magazines, shooting earplugs and a gun
safe with a rifle in it.
The files were heavily redacted to protect the students' identity and to withhold gruesome
details of the crime.
The Newtown shooting prompted a renewed US campaign for stricter firearms controls.
While no legislation was passed at a national level, some states - including Connecticut
and Colorado - imposed tougher gun laws. Other states loosened restrictions.