An assault-rifle attack at Nashville’s Covenant School that killed three children and three adults is the latest in a relentless cycle of mass shootings at American schools.Police said they believe the shooter – a 28-year-old Nashville woman armed with at least two assault rifles and a handgun – was a former student at the school. She was shot dead by police.Here are the deadliest gun massacres of the last 25 years in the United States:
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