A teenage girl was left in shock after she was mugged by two men in a tunnel on Monday.

The 16-year-old was approached by the men while she was walking into a pedestrian tunnel which goes under the railway line and connects Braemar Close to Tintern Close in Stevenage at around 6.30pm.

As she entered the Knebworth side of the tunnel the two men approached her. They grabbed her arm and demanded the money she was holding. She then dropped the cash and ran away.

The first man was described as around 20 years old, of medium build and with short dark hair. He was pale white and approximately 5ft 7in tall. He wore a blue Adidas tracksuit top, with a white logo on the side, and blue trousers.

The second man was also white, with a tan, and of a similar age and height. He was wearing black gloves and possibly a tracksuit.

Det Sergeant Hannah Treadwell is investigating and said: “We are appealing to anyone who was in the area at the time and who may have seen two men matching these descriptions, to contact us immediately, as you could have vital information which could help our inquiry. It is also possible that the men may have been around the Bragbury End area later that evening.

“Although the victim was unharmed, she is very shocked and shaken up by the incident and I want to trace these men as soon as possible.”

Anyone with information should call Herts police on 101.