Lead was ripped from a school roof in Maidenhead while teachers held a parents' evening beneath.
The thieves are believed to have struck at St Luke's School sometime between 8-8.30pm on Tuesday last week.
The Cookham Road primary has ordered artificial lead to repair the damage.
A pile of lead was later found dumped over a nearby fence.
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Police officers can be seen at Ten Pin Bowling in Maidenhead tonight following an incident earlier today.