He is having meltdown after meltdown...

Our son Nathan is four, turning five next month and has ASD. We have placed him in a mainstream school, grade RR and it has been a hectic week for him, us, his teachers at school. He is having meltdown after meltdown and is lashing out at the other kids by punching them, scratching them, or biting them severely. The parents are not happy and neither are the teachers. Please give us advice on how to deal with these abusive and often violent meltdowns as he refuses to go to timeout and threatens to punch the teachers. They don't know what to do or where to start to assist him.   

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