Help - my 7 year old has threatened another child

[unclehairysgirlfriend]

My DS has lots of problems with anxiety/panic attacks etc and really struggles at school. He's currently undergoing assessment for autism too - he has many challenging behaviours. School are generally very supportive and have put some things in place to make things a bit easier for him.

I have just received a message from the mum of a girl in his class to let me know that he had threatened to kill her with a knife! She was obviously very upset about it but didn't tell the teacher.
I've spoken to him and he's denying it though he did say she was calling him names so I think he probably has said it. I don't for one minute think he would ever do anything like that.

Now I just don't know what else to do - should I tell the school? I'm terrified he'll be excluded or something.

Please help!

[ArkATerre]

School really need to know so they can continue to support him and have the full picture as to how to do that.