A teenage boy has been missing for four days and police are appealing for the public's help.

Billy Gaffney, 15, from Watford, was last seen on October 21 in Stevenage however he is believed to be in the Watford area.

He is white, 5ft 6in and has short dark brown hair and blue eyes. He was last seen wearing a dark blue or black zip up hoody over a maroon T-shirt, mid blue jeans and black shoes.

Anyone with information should contact Hertfordshire Constabulary on 101.