A 14-year-old boy was punched in the face and had his mobile phone stolen during a robbery in The Racecourse park in Northampton.
The teenager was with two friends in the play area close to Barrack Road at 9am today when two men approached the group.
One of the men asked the boy for his mobile phone and when the boy refused he was punched in the face.
The two men then ran off, one towards Barrack Road and the other man towards Cowper Street.
The man he punched the boy is described as white or mixed race, between 17 to 22 years old, short black hair, stubble and wore a black zip up jacket and black tracksuit bottoms.
The second man, who had no direct involvement in the incident, is white, slim build and wore black clothes.