There is a woman (baal tshuva) on the street this was supposed to have happened, who, amongst others, has a 5 year-old daughter, who is known to have mental problems. She is known for calling the police sporadically. This is probably why the police were unsure how to proceed.
Meanwhile, there have been reports for a while of a young man who is suspected of ATTEMPTED molestation. The police are aware of it, but for some unknown reason are unable at this point to do anything