In April 1999, the fears of the media and violence-watch groups were legitimated in their eyes as investigations into the lives of Eric Harris and Dylan Klebold, the shooters in the Columbine High School massacre, revealed that they had been fans of the video game, "Doom", and had even created levels for it today dubbed "the Harris levels". A great deal of discussion of violence in video games followed this event with strong arguments made on both sides, and research into the phenomenon which had begun during the 1980s received renewed support and interest.