Police are searching for a teenage girl and a young man.
Chloe Hall, 16, was last seen leaving her home in Derwent Road, Harpenden at around 10.30am yesterday.
James Smith, 20, was last seen at the cinema at the Hatfield Galleria at around 10.30am, on Saturday morning.
Police said his disappearance is very unusual and his family are concerned.
Chloe is around 5ft 8ins tall and of slim build with long, light brown hair. She was last seen wearing a black hoodie, grey jeans and white plimsolls.
There are concerns for her welfare.
Anyone with information should contact Hertfordshire Constabulary on 101.
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