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By The Associated Press

The latest mass killing in the United States occurred Saturday night when three children ages 8, 9 and 14, and a 21-year-old adult were killed in a shooting at a child’s birthday party in California. Eleven people were also wounded at a Stockton banquet hall.

This is the country’s 17th mass killing this year . The killings are tracked in a database maintained by The Associated Press and USA Today in partnership with Northeastern University.

At least 81 people have died this year in U.S. mass killings, which are defined as cases in which four or more people die within a 24-hour period, not including the killer — the same definition used by the FBI.

So far this year, 14 of 17 recorded mass killings (82%) have inv

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