On April 19 , 1995 , Timothy McVeigh attacked the Alfred P. Murrah Federal Building in Oklahoma City because it housed regional offices for the FBI , Bureau of Alcohol , Tobacco , Firearms and Explosives ( ATF ) , and DEA , all of which had carried out raids that he viewed as unjustified intrusions on the rights of the people ; this attack caused the deaths of two DEA employees , one task force member , and two contractors in the Oklahoma City bombing . Subsequently , the DEA headquarters complex was classified as a Level IV installation under United States federal building security standards , meaning it was to be considered a high-risk law enforcement target for terrorists . Security measures include hydraulic steel roadplates to enforce standoff distance from the building , metal detectors , and guard stations
Oklahoma City bombing
Oklahoma City bombing
Drug Enforcement Administration