Three years ago, Adam Lanza walked into Sandy Hook Elementary School in Newtown, Conn., and killed 20 elementary school students and six adults in a massacre many considered a "turning point" in the gun control debate, Mic News reported.

Since the Sandy Hook massacre in December 2012, there has been 142 school shootings in the United States, including Thursday morning's shooting rampage on Umpqua Community College's campus in Oregon, this averages out to nearly one shooting a week, according to the watch group Everytown for a Safe Gun.

Thursday's shooting claimed the lives of 13 people, including the shooter, Oregon Attorney General Ellen Rosenbaum confirmed, according to KGW. According to law enforcement officials, as many as 20 people were injured during the rampage.

President Barack Obama made his first remarks on the shooting at UCC Thursday evening during a press conference.

"There's been another mass shooting in America," Obama said. "There are more American families - moms, dads, children - whose lives have been changed forever... It cannot be this easy for someone who wants to inflict harm ... to get his or her hands on a gun,"

According to Vox's Soo Oh's interactive map, there have been there have been nearly 1,000 mass shootings in less than three years, "with shooters killing at least 1,234 people and wounding 3,565 more."