A portrait of the active shooter may be sharpened by contrasting him with another type of mass murderer , the ideological killer . The Oklahoma City bombing exemplifies the type : in 1995 , Timothy McVeigh , who had ties to a disorganized militia movement detonated a truck bomb in front of the Alfred P. Murrah Building in downtown Oklahoma City , and the resulting blast killed 168people while wounding680
Oklahoma City bombing
Oklahoma City bombing
Active shooter