A teenager has been arrested after a robbery in Cassiobury Park.

A 16-year-old boy was threatened by a group of teens and his bag, wallet and mobile phone were taken.

Police launched a large search operation, and witnesses saw police cars heading down Rousebarn Lane in Croxley Green and parked on the road heading towards West Herts Golf Club.

A police helicopter was sent to the scene, along with a dog unit.

A 14-year-old boy was arrested in connection with the incident. He has been bailed until Friday, June 3.