Detectives have established from witness accounts that at least two of the men who carried out the attacks were astonished to be alive after the detonations systems for the explosives failed 侦破者已经从两个目击者的叙述内容中确定，至少有两名男子实施了这起爆炸袭击，令人惊讶的是，他们在引爆系统未能成功爆炸后还活着。
