警察达到时，扒手们早就跑了。
探员们说，尽管扒手们的作案方式改变了，但是其实质并没有变化。
It is not so much that the core elements of pickpocketing have been altered as the tone has been transformed, detectives say.
顾客们被警告提防扒手。
The customers were cautioned to take precautions against pickpockets.
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