The grandmother of missing 12-year-old Tia Sharp has made a plea for the child to contact her family and come home.
Police have said they are becoming increasingly worried about the schoolgirl who disappeared three days ago.
They say they have found no trace of her leaving her grandmother's home where she was last seen.
A search of CCTV footage and appeals to witnesses have unearthed no clues to what happened to her.
Police said Tia left her grandmother's house at midday on Friday, planning to travel five miles to buy shoes in Croydon, Surrey.
Her grandmother Christine Sharp told Sky News: "I was at work, but Tia was in the house with her granddad.
"He said she was going to catch the bus to go shopping in Croydon. It's a journey she's done before, but not on her own.
"I don't know how she was going to pay for the bus because she lost her bus pass ages ago. She also left her mobile phone charging in the house."
It is understood the "granddad" referred to is her grandmother's partner.
Plenty of buses and trams travel regularly between New Addington and Croydon town centre, but no driver remembers panicking up Tia.
Three detectives called at the house mid-morning to go over the events of Friday with family members.
Tia's mother Natalie was also at the house, one of a row of modern terraced homes on the New Addington estate.
Uniformed officers were calling on neighbours in the hunt for witnesses and clues to Tia's disappearance.
Home-made posters with the child's picture were stuck in car windows and walls and fences around the estate.
Neighbour Carol Hook said her daughters had joined local searches and were distraught that Tia was still missing after three nights.
She said: "We really don't know what else we can do. We expect the police are doing their best, but we feel pretty helpless."
Christine Sharp said: "Tia is very much loved, very much missed. We just want her to contact us, if she can."
Tia is white, 4ft 5in and slim, and was wearing FCUK glasses.
She was dressed in a yellow bandeau top over a white bra with visible cross straps, light grey leopard print leggings and black and pink Nike high top trainers.
She is known to frequent the Croydon, Mitcham and Wimbledon areas.
Anyone who has seen Tia or knows of her whereabouts should call 0208 721 4005 or the Missing People charity on 116 000.