What is the name of this movie?

I started watching this movie a long time ago and I never got to finish it and I would like to find it again, so here is what I remember about it: A teenage girl witnesses a death by some High School boys, they recorded the murder and watched the tape and then they saw the teenage girl hiding in the bushes... show more I started watching this movie a long time ago and I never got to finish it and I would like to find it again, so here is what I remember about it:

A teenage girl witnesses a death by some High School boys, they recorded the murder and watched the tape and then they saw the teenage girl hiding in the bushes watching, so they threatened her and told her if she told anybody they would kill her too, and I don't remember the rest.
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