by: Steven Nelson | U.S.News & World Report

The Des Moines Register published an interactive map Wednesday that allowed readers to identify schools in the state that do and do not have security guards.

The map was immediately criticized for providing would-be school shooters with an overview of easy targets. A Register staff member who answered the newspaper's general phone line Thursday told U.S. News that the map was live for 20 minutes before it was taken down.