Police are investigating a robbery in St Albans where a teenager had his bicycle stolen at knifepoint.

Two boys were approached by a man carrying a knife on Monday (July 1) at 16:35pm in the Marlborough Club sports field near the car park in Old Oak.

The man had threatened the victim, demanding the teenager to hand over his bicycle and then cycled out of Old Oak towards Cottonmill Lane.

The offender is described as white, of slim build, in his 20s and between 5ft 7in and 6ft tall. He had a small light brown beard.

The bicycle is a bright green Diamondback Heist 1.0 Bike, serial number LY17924469.

Detective Constable Colin Workman from the St Albans Local Crime Unit said: "This was a very scary experience for those young boys to have gone through, and we are doing everything we can to stop it from happening again.

"Fortunately, no one was hurt but that does not take away the severity of this incident.

"We’re asking anyone with any information no matter small to get in touch as it could help us conclude this investigation."

Anyone with information can contact DC Workman by emailing colin.workman@herts.pnn.police.uk, report information online at www.herts.police.uk/Report or speak to an operator in the Force Communications Room via online web chat.

It can be launched at herts.police.uk/contact, or call the non-emergency number 101, quoting 41/59402/19.

Crimestoppers can also be contacted at 0800 555 111 or via their untraceable online form at www.crimestoppers-uk.org.