▁building , ▁the ▁resistance ▁members ▁pulled ▁open ▁all ▁the ▁draw ers , ▁p iled ▁all ▁of ▁the ▁documents ▁onto ▁the ▁floor ▁and ▁d oused ▁them ▁with ▁ben z ene . ▁They ▁then ▁set ▁off ▁a ▁series ▁of ▁tim ed ▁explos ions , ▁using ▁explos ives ▁obtained ▁by ▁resistance ▁oper atives ▁from ▁a ▁m un itions ▁store ▁at ▁Na arden ▁for tr ess . ▁ ▁The ▁explos ions ▁set ▁the ▁building ▁ab la ze . ▁The ▁fire ▁department ▁( which ▁had ▁been ▁t ipped ▁off ▁about ▁the ▁assault ) ▁eventually ▁arrived , ▁but ▁delayed ▁putting ▁out ▁the ▁fire . ▁When ▁they ▁did ▁ultimately ▁come ▁into ▁action , ▁they ▁completely ▁d oused ▁the ▁building ▁in ▁water ▁in ▁an ▁attempt ▁to ▁cause ▁additional ▁water ▁damage ▁to ▁the ▁records . ▁ ▁The ▁d aring ▁assault ▁had ▁a ▁significant ▁psych ological ▁impact ▁on ▁the ▁residents ▁of ▁Amsterdam ▁as ▁well ▁as ▁the ▁Naz i ▁occup iers . ▁However , ▁it ▁was ▁only ▁partially ▁successful ▁in ▁destroy ing ▁the ▁civil ▁registry . ▁Only ▁ 1 5 % ▁of ▁the ▁records ▁were ▁completely ▁destroyed . ▁In ▁total , ▁ 8 0 0 , 0 0 0 ▁identity ▁cards ▁were ▁destroyed , ▁and ▁ 6 0 0 ▁blank ▁cards ▁and ▁ 5 0 , 0 0 0 ▁gu ild ers ▁were ▁removed ▁from ▁the ▁building . ▁ ▁After math ▁ ▁Following ▁the ▁bomb ing , ▁the ▁Naz is ▁immediately ▁offered ▁a ▁ 1 0 , 0 0 0 ▁gu ilder ▁reward ▁to ▁wh ome ver ▁could ▁identify ▁the ▁perpet rat ors ▁of