Police are appealing for witnesses after a straw bale was set alight in a field in Gorleston.
The fire to the one tonne straw bale and a 100 metre strip of stubble in a field off Excalibur Road was started sometime between 6pm and 7.30pm on Saturday 9 August.
Officers are keen to speak to two groups of young people who were seen in the area at the time. The first group is believed to have been made up of four males described as white and aged around 18 and 19-years-old. The second group, of up to six males, have been described as white, aged around 15 and 16-years-old and in hooded tops and jeans.
Anyone with information should contact PC Pete Richeda at Gorleston Police Station on 101 or call Crimestoppers anonymously on 0800 555111.