(Reuters) Investigators assembled “some very good evidence” to explain what drove a 20-year-old gunman to slaughter 20 children and six adults at an elementary school, police said on Saturday, a day after one of the worst mass shootings in U.S. history shattered a small Connecticut town.

The attacker, identified by law enforcement sources as Adam Lanza, opened fire on Friday morning at Sandy Hook Elementary School in Newtown, which teaches children aged 5 to 10. The shooter killed 26 people before turning the gun on himself, and was suspected of killing another person before the massacre.

“Our investigators at the crime scene … did produce some very good evidence in this investigation that our investigators will be able to use in, hopefully, painting the complete picture as to how – and more importantly why – this occurred,” Connecticut State Police Lieutenant Paul Vance told a news conference.

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