14 year old boy being abused please help!?

Okay, I am 14 years old and there is a boy in my cl, his family is less fortunate and don't exactly have the health care of most people. He is different in many ways than the other boy's in my grade. He is always talking about killing people, animals, even himself. the detail he goes into about these things is very frightening. He doesn't trust many people at all, no adults, just a few of the students that can tolerate his behavior, He has told me before that his father abuses him. at first i thought it was only a cry for attention considering he had 4 older brothers. then when he started showing me the marks i began to really listen to what he was telling me. then he came into cl one day after being absent the week before. he had a large cut on his neck that really looked alot like rope burn. So when i finally managed to get him to tell me what happened it terrified me... He had tried to kill him self, only the board that he had tied himself to snapped when he stepped from the ladder. So me and my friend who also herd the story went to the school consular hoping for help. we told her everything but nothing was ever done. that was about 4 months ago. things have not improved at all, here lately he has been telling me that he wants to bring a gun to school and kill all the students that tease him. the way he acts and talks leads me to also thing he may have some type of autism, the way his is socially is manly what makes me think that. its hard to talk to him and he obsesses over the smallist things. but its just a theory. please someone tell me what to do, it feels like there is no where left to turn and i am afread that he will hurt him self or someone else. thank you so much