A shooter who killed three 9-year-old students and three adults at a private Christian elementary school in Nashville Monday had maps of the school, left behind writings and scouted a second possible attack location, police said.

Police identified the shooter as Audrey Hale, a 28-year-old former student at the school, and called the attack targeted. Hale was shot and killed by police during the attack, which was the deadliest school shooting in nearly a year.

Hale, armed with three firearms, entered the Covenant School by shooting through a side door, Metro Nashville Police Chief John Drake said at a news conference.

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