NEWTOWN (Reuters) – Residents of the small Connecticut community of Newtown were reeling on Saturday from one of the worst mass shootings in U.S. history, as police sought answers about what drove a 20-year-old gunman to slaughter 20 children at an elementary school.

The attacker, identified by law enforcement sources as Adam Lanza, who once attended Newtown High School, opened fire on Friday morning at Sandy Hook Elementary School, which serves children aged 5 to 10. He ultimately killed at least 27 people, including himself.

Police said another adult was found dead at a related crime scene in the town, which many media accounts indicated may have been the shooter’s mother, Nancy Lanza.

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