Police are appealing for help to find a teenage boy who has been missing for four days. Kassim Adnan Kassim was last seen in the Gravesend area on Saturday morning. The 16-year-old is described as 5ft 5in and of slim build with short, dark braided hair. He was wearing black trousers, a white T-shirt, a black hooded top and black trainers. Kassim may have used the public transport network as he has links outside of Kent, to areas in London, Liverpool and Leicestershire. Anyone with information on his whereabouts should call 999 quoting reference 10-0488.