FBI says that about 20 students might have known about the shooting rampage before it actually happened. Many of them might have been involved in the planning process. Now they are checking dozens of school computers to find related emails and text files.
The Columbine 2005, shooting at Red Lake High School happened about two weeks ago. One US student killed his grandparents and seven more people at his high school. This rampage was the worst school shooting since Columbine massacre in 1999. After killing the 9 people the gunman killed himself after exchanging fires with police.