Saari had a YouTube account where he uploaded videos of him firing a handgun at a local shooting range . Among the user 's YouTube account favourites was footage of the Columbine High School massacre . Finnish police had been informed about the YouTube videos in an anonymous tip-off on the Friday before the shooting . The police talked to Saari and searched his home on the day before the incident , Monday 22 September . They found no reason to arrest him as he held a temporary weapons permit . In August 2008 , Saari had obtained a licence for a .22-calibre ( 5.6 mm ) pistol . The police said that Saari did not have a criminal record . However , a police inspector was subsequently charged with dereliction of duty , and his court case began in September 2009
Columbine High School massacre
Columbine High School massacre
Kauhajoki school shooting