Removing a child / CAS

[Kimpaque]

Hello,
I'll explain what happened in detail last week with 2 of the children.

One of the children out of the blue threw another child off a play chair.. The child who got thrown had severe scratches and a few bruises on her arm. This was an act of violence I've never seen before... She grabbed her so hard and threw her off. This all happened so quickly and all while I was changing a diaper. I ran over (10 feet away), to help the injured child and in the meantime the child who hurt is now grabbing her own face and "self hurting" herself all while screaming blue murder!! I immediately put her in time out in hopes to explain that it wasn't nice and she doesnt do it again!!
I was so mad that I immediately expelled her. The father of the other child (injured) is a police office and said this is assault and was furious.
Now, this parent (the girl who hurt the other one and herself), works for CAS. She told me she had no choice but to report this. She said she only reported the pictures.
Has anyone ever dealt with a similar story or can anyone help?
I've never had anything like this ever happen and I've always had a nice group of children. I can get amazing references from current and past parents.
She said If they are to contact me it will be this week. What do you think might happen?