Simon and Hallie have done this as well. Usually it is over a toy or one of them being cranky. It was really bad when I first introduced Hallie into my home and now they still have their occasional fights but not nearly as bad as they used to. I had a trainer once tell me to NOT interfere and I about passed out. What I started to do when they would fight is make a loud noise and it would starlte them and they would quit.
I hope your babies are ok
I know how horrible it is.