Officers are appealing for two witnesses to come forward following an assault in Hemel Hempstead.
The incident happened on Wednesday, June 1. Between 2.30pm and 3pm, the victim – a woman in her twenties – was walking through the underpass from Jarman Park towards the town centre when four teenage boys approached.
They blocked her path and when she challenged them, one of the boys began punching her. She was also verbally assaulted.
PC Rebecca Maddock, who is investigating, said: “This was a frightening ordeal for the victim and we have been doing everything we can to find those responsible.
“Our inquiries have found that two members of the public, a male and a female, are believed to have witnessed what happened, with the male chasing the boys away.
“If this was you, please get in touch straight away as you may be able to help us progress our inquiries.
“I am also keen to hear from anyone else who believes they have information. The first male is described as having frizzy afro-style hair, aged under 16 and possibly mixed race. The second male is described as white and under 16. The third male is described as white and aged 16 or 17 years old. He had a bike with him and was wearing a black baseball cap, dark trousers and a black hooded jacket with a white logo down the sleeve (possible Nike). The fourth male is described as white with brown, curly-ish hair and of a quite small build. He was wearing a red jacket and carrying alcohol.
“If you can help, please get in touch by calling the non-emergency number 101 or email me at email@example.com quoting crime reference 41/43573/22.”