A young man wearing dark clothing set light to small sapling trees in a field off St Johns Close, Mildenhall.
The fire service attended and extinguished the fire, but the offender returned and set fire to another tree near a school. The incident happened between 9pm and 9.50pm on August 2.
Anyone with information should contact the Crime Investigation Bureau (CIB) on 01473 613500 or Crimestoppers on 0800 555 111.
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