NEW YORK CITY? - Get a rope !! Bad nanny in NYC

I witnessed an alarming incident at a park in Lower Manhattan in the morning in which I believe a woman was maltreating the small child she was looking after, it's not clear to me if she was the mother or a nanny but I believe it was a nanny. I phoned CPS but because I could not give her name address,plate number etc, they could not investigate the incident, they told me to try to get more info and see if it happens again. Does this blog be specific to NYC? I have taken pictures if that will help