Straw bales in a field in Mettingham were deliberately set on fire earlier this week.
Police are now investigating the incident which happened on Tuesday between 5.30pm and 6.20pm.
The bales were in a field near Low Road and were extinguished by fire fighters.
Officers would like to speak to anyone who may have information about how the fire started.
Call the Beccles and Bungay Safer Neighbourhood Team on 101.
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