Police are appealing for witnesses following an incident Castlefields Park in Wellingborough.
On Monday, May 16, between 8am and 8.15am, a 14-year-old girl was walking across the park from Irthlingborough Road towards Park Road, when she was chased by a group of five males who came from behind trees.
The girl ran out of the park and the males, who were dressed in North Face clothing and wearing balaclavas, ran off down Irthlingborough Road.
Anyone who was in or near the park on around the times stated, and who may have seen anyone fitting the description or acting suspiciously, is asked to call Northamptonshire Police on 101, quoting incident number 22000278637.