Detectives investigating a robbery in Watford are appealing for information and witnesses, in particular a dog walker.
It happened in Garston Lane, at the junction with Fourth Avenue, between 8.45pm and 8.50pm on Wednesday, October 9.
The victim, a 16-year-old boy, was approached by three teenage boys who assaulted him before ordering him to hand over his mobile phone.
He suffered an eye injury as a result of the assault.
The first offender was aged around 16 to 18 years old, of mixed race and between 6ft 2in to 6ft 4in tall.
He was of large build and had long, black afro-style hair.
He was wearing a dark-coloured tracksuit with a hood, a Puffa-style coat and lightweight gym shoes.
The second offender was black, aged around 16 years old and approximately 5ft 8in tall. He was of skinny build and was wearing a dark-coloured tracksuit.
The third offender was mixed race, aged around 16 years old and approximately between 5ft 9in and 5ft 10in tall.
He was of medium build and was wearing a charcoal-grey coat with the hood worn tightly around his face.
It is believed a man who was walking his dog near to a block of flats called TreebridgeHouse, on the corner of Garston Lane, may have witnessed part or all of the incident.
Detective constable Lewis Mortimer, from the Watford Local Crime Unit, said: “The victim has been left shaken by his ordeal and I want to reassure him that we’re doing all we can to identify those responsible.
“We are conducting extensive enquiries however, we are particularly keen to trace a man who the victim saw walking their dog at the time of the incident. We believe they will have vital information that could assist our investigation so if you think this was you, then please get in touch as soon as possible.”
Alternatively you can contact Crimestoppers anonymously on 0800 555 111 or visit their website crimestoppers-uk.org.