HARTFORD, Conn. -- Investigators have a theory that Adam Lanza's interest in Norwegian mass murderer Anders Behring Breivik might have led to the Dec. 14 massacre that left 20 children and six women dead at Sandy Hook Elementary School in Newtown, Conn.
The theory is based in part on several news articles about Breivik that investigators found in one of Lanza's two bedrooms at the Newtown home where he lived with his mother, Nancy Lanza, according to law enforcement sources familiar with the investigation.
The sources emphasized that an interest in Breivik is just one theory. Sources said Connecticut law enforcement officials traveled to Washington, D.C., last week to brief unidentified federal authorities on the status of the investigation and discussed the possible Breivik connection.
Breivik set off bombs in downtown Oslo in July 2011 that killed eight people before moving to Utoya island, where he shot and killed 69 people, most of them teenagers attending a summer camp. He wounded hundreds. He was sentenced last August to 21 years in prison.
The rail-thin Lanza was carrying three weapons and hundreds of rounds of ammunition when he shot his way into Sandy Hook Elementary shortly after 9:30 a.m.
Law enforcement sources said Lanza bypassed the first two classrooms he encountered after entering Sandy Hook before going into the class of substitute teacher Lauren Rousseau. Investigators believe he started there and was planning to work his way back toward the front entrance where he could get more ammunition from his nearby car if needed.
Lanza killed all but one student in Rousseau's class, where the children were massed together in a back corner of the room near a bathroom. One girl escaped because she played dead and ran out of the room after Lanza left.
He then backtracked to teacher Victoria Soto's room.