Police say they are “increasingly concerned” for a woman who has not been heard from since Wednesday evening.
Sarah Everard, 33, vanished while walking to her home in Brixton, south London, from the nearby Clapham Junction area.
Ms Everard, whose last known location was near Clarence Avenue, had met a friend and was walking home at about 9pm.
The marketing manager spoke to her partner for about 15 minutes, but her friend Rose Woollard told online newspaper Brixton Blog she has not been heard from since.
Shortly after the phone call ended at 9.28pm, her friends believe that something happened to her.
They were unable to contact her on Thursday when they notified the police at about 8pm.
Ms Everard, described as 5ft 4in (162cm) with a slim build and blonde hair, was wearing a green coat and black and white trousers, Lambeth Police said on Twitter.
Other reports described the trousers as dark blue and white and said she also had white trainers, a white iPhone and green in-ear headphones.
Friends and family have mounted a serious effort to gather as much information as possible, sharing information via social media and reaching contacts as far and wide as Dubai and Lebanon.
They are retracing her steps as she travelled home, distributing flyers and sharing posters with the local community.
In a plea for her return, family and friends said: “Sarah, we are here for whenever you are ready.
“We can listen, talk you through what help you need, pass a message for you and help you to be safe.”
