Chelsie Davies, aged 15, and Jack Johnston, aged 12, were reported missing earlier today and are believed to be together.
Chelsie is described as being 5ft 3 inches tall and of slim build. Jack is described as having short dark brown hair.
Officers are appealing for anyone who has information on their whereabouts to contact the police.
Anyone with information can report online at https:///orlo.uk/S0T71 or call police on 101.