 On May 11 , 1972 , three bombs were set off by the West German terrorist group Rote Armee Fraktion ( Red Army Faction , i.e. , the Baader @-@ Meinhof Group ) . Two bombs went off in a rotunda in the rear entrance of the IG Farben building , and a third exploded in a smaller building behind the IG Farben building that was serving as the US Military 's officer 's club . Lt. Col. Paul Bloomquist was killed by the last bomb , and dozens of Americans and Germans were injured . The IG Farben building was attacked again by the same group in 1976 and 1982 . Consequently , the publicly accessible adjoining park became part of a restricted military zone which also included the military living quarters and work areas at the rear of the building . 
