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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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After the shootings, which together left 31 people dead, President Joe Biden renewed calls for stronger gun laws and questioned whether people as young as 18 should be allowed to purchase firearms. In the past, Biden has called for banning assault weapons and expanding background checks. Many Republicans oppose the measures.