On Tuesday morning, a gunman walked into Reynolds High School in Troutdale, Oregon, and killed one student and injured a teacher. According to police, he then took his own life in a school bathroom while cops encircled the building.

The teacher, Todd Rispler, will luckily survive his wounds.

The gun safety organization Everytown said Tuesday's incident was the 74th shooting in a school in the United States since the tragedy at Sandy Hook Elementary School, when Adam Lanza broke through a glass door and gunned down 20 children at close range in December 2012.

A map of 74 school shootings since Sandy Hook. This includes assaults, homicides, suicides, and accidental shootings that take place in a school building or on school grounds. Image: Everytown/Zeemaps/Mark Gongloff

It comes five days after a shooting at Seattle Pacific University, and less than one month after a shooting at Clark Street School in Milwaukee, Wisconsin.

Everytown released data that include incidents that were "classified as school shootings when a firearm was discharged inside a school building or on school or campus grounds, as documented in publicly reported news accounts," and "includes assaults, homicides, suicides, and accidental shootings." The data was mapped on Zeemaps by The Huffington Post's Mark Gongloff.

"How many more before our leaders pass common-sense laws to prevent gun violence and save lives? Communities all over the country live in fear of gun violence. That’s unacceptable. We should feel secure in sending our children to school — comforted by the knowledge that they’re safe," Everytown posted on its website.

The site also notes the incidents were identified primarily through media reports, meaning its likely this is an undercount of the true total since the Sandy Hook rampage.