At least 157 people were killed and 270 were injured last year in unintentional shootings by children, according to Everytown, an advocacy group for firearm safety.

The children who pulled the trigger were most often teenagers ages 14 to 17 or children ages 5 and under, according to Everytown’s data, which is compiled from media reports. Roughly half of the incidents involved children who shot themselves. In the other half, someone else was injured or killed — usually another child.

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