A man had his mobile phone stolen while walking along a path in Wellingborough.
The man was walking along Breezehill Way footpath near Thrush Lane when he was approached from behind by the offender, who then robbed him of his phone.
The robbery took place at about 6pm on Monday, June 8.
The offender is described as black, in his mid-twenties, about 6ft and of chubby build.
He had a full beard and wore a black baseball cap, a black weatherproof jacket and dark coloured tracksuit bottoms.
Witnesses, or anyone with any information, are asked to call Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555111 or use the anonymous online form at www.crimestoppers-uk.org.