The stepfather of Tia Sharp has made an emotional appeal to people to help find the missing 12-year-old.

David Sharp screamed with emotion as he pleaded: "Just find my little girl."

Wearing a find Tia campaign T-shirt, the 29-year-old said the family were "in bits" as the search entered its fourth day.

"I just want to find my little girl," he said. "How would you feel if it was your daughter?"

"I haven't slept in four days. Natalie (Tia's mother) is in bits. The police have done everything."

Tia has not been seen since leaving her grandmother's home in New Addington, south-east London, at around midday on Friday.

Tia told relatives that she was going to the Whitgift Centre in Croydon town centre. She has not gone missing before.

Police have been searching through hours of CCTV footage but say so far they have not found any trace of the schoolgirl.