The game again sparked controversy throughout a period of school shootings in the United States when it was found that Eric Harris and Dylan Klebold, who committed the Columbine High School massacre in 1999, were avid players of the game. While planning for the massacre, Harris said that the killing would be "like playing "Doom"", and "it'll be like the LA riots, the Oklahoma bombing, World War II, Vietnam, "Duke Nukem" and "Doom" all mixed together", and that his shotgun was "straight out of the game". A rumor spread afterwards that Harris had designed a "Doom" level that looked like the high school, populated with representations of Harris's classmates and teachers, and that Harris practiced for his role in the shootings by playing the level over and over. Although Harris did design "Doom" levels, none of them were based on Columbine High School.