We’re appealing for witnesses to a public order incident in Frome.
The incident happened at around 7pm on Saturday, 18 June.
Two boys were on the basketball court in Victoria Park when they were threatened by a group of other boys aged around 14 or 15.
One of the teenagers had a pocketknife. He is described as white, 5ft 8ins tall and wore a facemask and black clothing.
The victims ran away and were not physically harmed.