This is my city. This park is in a bad part of town and these incidents(not 20-person attacks) have been happening more frequently in the past 5 years. If everyone involved is of aboriginal ethnicity; it doesn't get much media attention. Unless something like this happens, where a mother and a child are randomly attacked in broad daylight in a public park.
Yes all locals. The new arrivals are smart and have started/bought many businesses and franchises.