A 16-year-old boy was approached from behind and punched to the ground in Knebworth by a gang of thugs who stole his mobile phone and trainers.

Officers are appealing for witnesses following the robbery at the recreation ground in Watton Road, which happened between 9.15pm and 9.30pm on Friday, June 23.

The victim was sitting on a bench when he was approached from behind and punched, with the blow knocking him to the ground.

He was punched several more times on the ground before the thieves made off, taking his phone and trainers with them.

The boy was left with bruising around his left eye and a cut lip.

Det Con Jeanette Walker, who is investigating, said: “At the time of the robbery there were lots of teenagers in the area celebrating the end of their GCSE exams.

“I am appealing for anyone who was at the recreation ground and saw the incident or believes they know who is responsible for the robbery to get in touch.”

Anyone with information should call police on the non-emergency number 101, quoting crime reference number G1/17/1905, or report it online at contacthertspolice.uk/report/crime.

Alternatively contact Crimestoppers anonymously on 0800 555 111 or through their anonymous online form at crimestoppers-uk.org. No personal details are taken, information cannot be traced or recorded and you won’t need to go to court.