They’re much less damaging than a guy gang, they don’t break windows or steal the whole car, instead they walk around neighborhoods looking for cars with doors opened as you can see on the video below. Then they steal whatever they want, apparently this was all for fun.
“They were two sisters and their neighbour, and they targeted the cars in their neighbourhood just for fun. Investigations revealed that they were just having fun. However, since no case was filed against them, they were released.” [Source]