Help with behaviour problem - inspiration required

Hello! mum to a 7 yr old high functioning autistic bundle of joy (most of the time!) little boy.  We have our issues from time to time but for the moment are bumbling along fairly well.  But this week he has returned to his (special) school after the Easter break and his behaviour has taken a new turn - he keeps throwing stones and/or sand.

 Each day there has been some incident - out on a picnic, throwing stones (at other kids and teachers), out in the park,yep - found a stone and chucked it and twice in our garden - big stone chucked it against the neighbours brand new house wall.  Lovely neighbour but even she has her limits.  

So for the most part we are all about reinforcing positive behaviours but this is really tricky as it just seems such an unacceptable/potentially dangerous thing to do (No one hurt yet but only a matter of time.)  Do I discipline him? I mean I obviously give him the cross "do not throw stones" grump but it seems so ineffectual. I actually know that this is a phase and that in 3 or 4 months' time, it will have passed - but this isn't something I can turn a blind eye to for 3 or 4 months - which is my usual style with less obtrusive/dangerous behaviours.        

Inspiration will be most gratefully received.

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