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It was, police said, an “unfortunate tragedy.”

“Obviously, this is an extremely difficult environment for the first responding officers and EMS personnel,” the department’s news release said, “and should serve as a tragic reminder to all gun owners to think about safety around small children.”

According to the Indianapolis Star, the boy’s mother had a permit for a gun.

So far this year, more than 60 children under the age of 18 have unintentionally shot themselves or another person in the United States, according to data from Everytown for Gun Safety, a gun-control advocacy group.

The 2016 tally includes a four-year-old whose mother had bragged on social media that he “gets jacked up to target shoot.” Hours later, the boy found a gun in the vehicle she was driving and pulled the trigger. The woman was shot in the back; her son wasn’t hurt in the incident.

Following the death in Indianapolis, Shannon Watts, founder of Moms Demand Action for Gun Sense in America, said in a statement that “this incident is a heartbreaking — yet preventable — tragedy. But there are clear solutions to help prevent unintentional shootings, starting with responsible gun ownership.

“This incident reinforces for gun owners and non-gun owners alike that the responsibility falls on adults to ensure the safety of our children by storing guns locked, unloaded and separate from ammunition. Children should never be around unsecured guns, full stop.”

In 2014, The Washington Post’s Mark Berman took a look at how many children have been involved in unintentional shootings across the country.

“We know how many times children die each year as a result of gun deaths,” Jon S. Vernick, co-director of the Johns Hopkins Center for Gun Policy and Research, said at the time. “We don’t know how many times children pull the trigger and someone dies.”