This is from Livy, Ab urbe condita 1.59.3. Lucretia has been raped and, although innocent, cannot live with the shame, so she kills herself by plunging a dagger into her heart. Brutus draws the bloody knife from her breast and vows revenge. Here is the complete sentence:
elatum domo Lucretiae corpus in forum deferunt concientque miraculo, ut fit, rei novae atque indignitate homines.
I cannot make any sense out of the little phrase in my title. Ōrberg explains it as ut fieri solet, which is equally opaque to me. Perhaps, “as it is accustomed to be done,” i.e., stir up a crowd by wonder or amazement? Does the miraculo rei novae mean “by the wonder of the novel thing”, referring to the unprecedented violation of a virtuous woman? I would be grateful for your ideas.