http://www.city-data.com/city/Bridgeton-New-Jersey.html
There are a couple things I want to point out with the attached city data about Bridgeton.
First, a huge spike in rapes from 2015-17. (2017 is the latest data on rapes). Also, a high unemployment rate of 8.2% vs. 4.1% for Jersey overall, and 3.7% for the U.S.
I wish I had the rape data on 2018 to present, but if that concerning spike continued, it could possibly suggest a serial rapist in that area. Not knowing the age of the victims, it's hard to surmise if the Victims included children.
Given this alarming rape data for Bridgeton, I firmly speculate this was a local Perp. Someone who looked familiar at that park/playground area. Someone who wasn't a local who frequented that playground/ball area would have stood out like a sore thumb.
It's a local. A known.
Amateur opinion and speculation