Shani, that sounds like a very scary situation. I think I would be scared too if I was minding my own business and suddenly someone came out of nowhere and started yelling and screaming at me. It is also nerve-wracking (sp?) to have to talk to the police or other authority figures and write out a statement and hope that someone believes you.
I teach high school, and 2 years ago a student slapped my butt as I walked by his desk. I didn't have to involve the police or anything, but I reported it to the principal but even that was scary. Like teens, teachers tend to be pretty much treated as guilty until proven innocent in order to protect the kids, so even as an adult I was worried that people wouldn't believe me and would somehow think it was my fault. My hand was shaking so badly as I wrote out the statement, the principal made me write it over neatly! In the end, justice prevailed, but it did take a few days to work it out. So be patient.
Is there any other place you and your friends can hang out after school? Some place safer, less out in the open?