Police are looking for a teenager from Twickenham who has been missing since December 3.

Sam Jeffries, 15, was last seen at home at about 8am that morning, roughly when he left home, and has not been seen since.

Sam had been in touch with family, friends and police officers but stopped contacting them in the past couple of days. His phone has since become uncontactable.

Officers have become increasingly concerned about his safety and wellbeing.

Sam is white, about 5ft 11in and slim.

He has short brown hair, braces and was thought to be wearing grey tracksuit bottoms, a heavy grey hooded top, white trainers and a red Burton ski jacket.

He was not thought to have taken a change of clothes.

He is known to frequent west London, particularly Richmond and Hounslow, and possibly travelled to London Waterloo recently.

Anyone who has seen Sam or knows where he is should call police in Richmond on the 101 number.