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Death toll from Canada's worst mass shooting rises to 19

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US - Mass shooting at gay nightclub in Orlando leaves 50 dead, \

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Today marks 32 years since the worst mass shooting in Canadian history

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Video: Retired officer recalls city's worst mass shooting

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5 deadliest U.S. modern mass shootings

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20 years since the worst mass murder in Fresno history | Marcus Wesson Murders

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The Worst Mass School Shootings in Modern American History

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At least 18 people killed in deadliest mass shooting this year | WNT

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A gunman who killed 10 people in the worst mass shooting in Alabama history had a list of employers

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