Credit: Jim Watson/AFP/Getty

There are more mass shootings in states with weaker gun laws, according to a new study published in The BMJ, a medical journal, on Wednesday.

The study, from researchers at Columbia, New York University, Boston University, and the University of Pennsylvania, analyzed states’ mass shooting rates, the permissiveness of their firearm laws, and levels of gun ownership from 1998 to 2015. It then tested each of these to see if there was a link.

The result: Where there are more guns, there are more mass shootings. And where gun laws are weaker, there are more mass shootings.

Two charts showing a state-level correlation between mass shooting rates and both levels of gun ownership and the permissiveness of gun laws.The BMJ

“A 10 unit increase in the permissiveness of state gun laws was associated […]

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