Police have launched a search for a missing teenager from Watford.

Rhianna Alcott was last seen at her home on Monday at 11.18pm.

The 13-year-old is described as being slim, about 5ft 3ins tall, with very long straight dark brown hair.

She was last seen wearing a black shoulder-less top, light grey trousers and dark brown trainers and may be carrying a dark brown shoulder bag.

Hertfordshire Constabulary believe she may be in Watford or neighbouring London boroughs.

Officers are concerned for Rhianna’s welfare and are urging anyone who sees her, or knows of her whereabouts, to contact police straight away via Hertfordshire Constabulary’s non-emergency number, 101.