▁Amsterdam ▁civil ▁registry ▁office , ▁with ▁the ▁aim ▁to ▁destroy ▁the ▁records , ▁without ▁causing ▁any ▁loss ▁of ▁life . ▁The ▁mission ▁was ▁particularly ▁difficult ▁because ▁security ▁at ▁civil ▁reg ist ries ▁had ▁been ▁tight ened ▁up ▁after ▁a ▁similar ▁assault ▁on ▁an ▁office ▁in ▁W agen ingen ▁in ▁later ▁ 1 9 4 2 . ▁Security ▁gu ards ▁were ▁now ▁posted ▁at ▁strateg ic ▁locations ▁in ▁the ▁Amsterdam ▁civil ▁registry ▁office . ▁The ▁group ▁prepar ing ▁the ▁attack ▁included ▁a ▁number ▁of ▁local ▁artists ▁and ▁medical ▁students , ▁including ▁several ▁Jews ▁and ▁hom osex uals , ▁as ▁well ▁as ▁a ▁group ▁of ▁resistance ▁members ▁behind ▁the ▁c land est ine ▁publication ▁R atten k ru id . ▁ ▁Bomb ing ▁ ▁The ▁assault ▁on ▁the ▁civil ▁registry ▁office ▁at ▁Pl antage ▁K erk la an ▁ 3 6 , ▁a ▁former ▁concert ▁hall ▁directly ▁adjacent ▁to ▁the ▁main ▁entrance ▁of ▁Art is ▁zoo , ▁took ▁place ▁on ▁the ▁night ▁of ▁ 2 7 ▁March ▁ 1 9 4 3 . ▁Dis gu ised ▁in ▁police ▁uniform s , ▁the ▁resistance ▁group ▁approached ▁the ▁security ▁gu ards ▁and ▁told ▁them ▁that ▁they ▁had ▁come ▁to ▁search ▁the ▁building ▁for ▁explos ives . ▁The ▁gu ards ▁believed ▁their ▁story ▁and ▁let ▁them ▁in . ▁Two ▁medical ▁students ▁then ▁sed ated ▁the ▁gu ards ▁by ▁inject ing ▁them ▁with ▁phen obar b ital , ▁and ▁the ▁un cons cious ▁gu ards ▁were ▁carried ▁inside ▁the ▁zoo ▁through ▁a ▁back ▁door . ▁ ▁Once ▁inside ▁the