Uttam Pradesh

So Uttam Pradesh is proving a point again. Couple of bikers kidnapped the son of country head of Adobe. Sad story. I was reading the post from rediff. The most interesting paragraph is as follows.

Hideouts of known kidnappers are being raided in order to nab the culprits and rescue the child. "We have some leads," police have said but refuse to share details.

Now what I don't understand is the fact that if these are known kidnappers then why are they not arrested beforehand itself. Kind of misses the commonsense for me. Anyway, I just hope that this ends well.