Police and volunteers have been combing Oxford for an 80-year-old woman who disappeared four days ago.

Police are increasingly concerned for the welfare of Elizabeth Grigs, known as Betty, last seen at her home in Edgeway Road, Marston, around lunch time on Friday.

She received a telephone call at 7.30pm that day but has not been heard of since.

She is 5ft 5in tall with brown eyes, bushy eyebrows, and long brown hair usually tied in a bun. She is frail and has poor eyesight. She lives alone and does not have family in the area.

Officers and volunteers have been looking for her, with help from the police helicopter and police dog teams.

Pc Jane Crump said: "We are very concerned because she is unwell and could be confused."

Call 08458 505505.