A shooting last weekend at a children's birthday party in California that left four dead was the 17th mass killing this year — the lowest number recorded since 2006, according to a database maintained by The Associated Press and USA Today in partnership with Northeastern University. Crime-courts

A California family was about to cut the cake when gunfire erupted at a toddler's birthday party

By SOPHIE AUSTIN and CHRISTOPHER WEBER - Associated Press

Crime-courts

A list of mass killings in the United States this year

By The Associated Press

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