What should I do if I know someone is in an abusive dating relationship?

I know this girl, who is dating this guy, and I think she's in an abusive relationship. I don't feel close enough to her to approach her about this issue. I don't really feel close enough to her because we're not exactly friends. We just give each other rides to practice sometimes, since we live near each other. Some of the reasons why I consider it to be a very serious problem is because:

1. He smashed her iPhone to pieces.
2. Pulled her hair.
3. "Man-handled" her.
4. Attempted to run her over with his car.

I don't have actual proof of this, but there are other signs that he has been physically abusing her in other ways as well, such as punching and smacking. I know for sure that she is in an abusive relationship, and I know how dangerous these can be, especially in the long run.

Knowing this information, what should I do about the situation?

See talk to her about it even though you think your not that close cuz its the right thing to do.

other than that i really think you should have her back if this is an abusive relationship but first talk to the girl and if she says its not your business then stay the hell away

The wost thing you can't do is call the police. Even if she's mad at you, Its the best thing for her. You have enough solid evidence to probably get him charged or even get a hold of her parents and tell them of your concerns. Even though you guys aren't friends doesn't mean you shouldn't stick up for other human beings.