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Lanza obsessively edited mass shooting Wikis, sought info on turning semiautomatic guns into fully capable killing machines before Newtown massacre
![MassShootingTracker on X: "(🧵1a/11) On this date (Dec. 14) in 2012, a 20-year-old male shot and killed his mother before using her AR-15 rifle to kill 20 children and 6 adults at MassShootingTracker on X: "(🧵1a/11) On this date (Dec. 14) in 2012, a 20-year-old male shot and killed his mother before using her AR-15 rifle to kill 20 children and 6 adults at](https://pbs.twimg.com/media/GBUQi90XEAAi-Cb.jpg)
MassShootingTracker on X: "(🧵1a/11) On this date (Dec. 14) in 2012, a 20-year-old male shot and killed his mother before using her AR-15 rifle to kill 20 children and 6 adults at
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