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Mass shooters exploited gun laws, loopholes before carnage

The latest suspected U.S. mass shooters whose ability to obtain guns has raised concerns. In some cases shooters got guns legally under current firearms laws, or because of background check lapses or law enforcement's failure to heed warnings of concerning behavior.

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The suspects in the shootings at a Uvalde, Texas, elementary school and a Buffalo, New York, supermarket were both just 18, authorities say, when they bought the weapons used in the attacks — too young to legally purchase alcohol or cigarettes, but old enough to arm themselves with assault weapons.