Demonstrators protested in Nashville, site of latest attack, as tempers flared in Washington, DC, over gun law reform.
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Commission lays out long list of failures leading up to and during rampage that left 22 dead in province of Nova Scotia.
Police release body camera footage of attack at Christian primary school that left three children, three adults dead.
Nashville shooting that killed six is the latest school attack to raise questions about easy access to assault weapons.
