CHICAGO (AP) — New research shows active shooters with semi-automatic rifles wound and kill twice as many people as those using non-automatic weapons.

But the analysis shows that regardless of the weapon used, chances of dying if hit are the same.

READ MORE: St. Paul School Board Votes To Close 6 Schools Amid Declining Enrollment, Sustainability Concerns 

Researchers say that’s because these attacks tend to occur in relatively confined spaces, with shooters whose only intent is to kill.

Scientists examined FBI data on nearly 250 active shooter incidents in the United States since 2000. Almost 900 people were wounded and 718 were killed.

READ MORE: Minneapolis Sees 90th, 91st Homicides Of 2021 After Violent Night

Roughly four people on average were killed in semi-automatic attacks, versus about two in other attacks.

The results were published Tuesday in the Journal of the American Medical Association.

MORE NEWS: Wizards Beat Wolves 115-107; Towns Hurts Himself Dunking

(© Copyright 2018 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)